Mercurial > hg > nginx-site
annotate xml/en/docs/njs/index.xml @ 2244:467aef18bf12
Renamed the "About njs" page.
author | Yaroslav Zhuravlev <yar@nginx.com> |
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date | Mon, 24 Sep 2018 19:10:17 +0300 |
parents | xml/en/docs/njs_about.xml@f134633cff5c |
children | 87a0e2c73a25 |
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1 <?xml version="1.0"?> |
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2 |
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3 <!-- |
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4 Copyright (C) Nginx, Inc. |
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5 --> |
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6 |
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7 <!DOCTYPE article SYSTEM "../../../../dtd/article.dtd"> |
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8 |
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9 <article name="njs scripting language" |
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10 link="/en/docs/njs/index.html" |
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11 lang="en" |
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12 rev="23"> |
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13 |
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14 <section id="summary"> |
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15 |
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16 <para> |
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17 njs is a subset of the JavaScript language that allows |
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18 implementing location and variable handlers in |
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19 <link doc="../http/ngx_http_js_module.xml">http</link> and |
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20 <link doc="../stream/ngx_stream_js_module.xml">stream</link>. |
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21 njs is created in compliance with |
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22 <link url="http://www.ecma-international.org/ecma-262/5.1/">ECMAScript 5.1</link> |
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23 (strict mode) with some |
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24 <link url="http://www.ecma-international.org/ecma-262/6.0/">ECMAScript 6</link> |
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25 extensions. |
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26 The compliance is still evolving. |
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27 </para> |
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28 |
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29 </section> |
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30 |
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31 |
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32 <section id="supported" name="What is currently supported"> |
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33 |
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34 <para> |
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35 <list type="bullet"> |
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36 |
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37 <listitem> |
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38 Boolean values, numbers, strings, objects, arrays, |
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39 functions, and regular expressions |
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40 </listitem> |
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41 |
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42 <listitem> |
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43 ES5.1 operators, ES7 exponentiation operators |
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44 </listitem> |
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45 |
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46 <listitem> |
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47 ES5.1 statements: <literal>var</literal>, <literal>if</literal>, |
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48 <literal>else</literal>, <literal>switch</literal>, <literal>for</literal>, |
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49 <literal>for in</literal>, <literal>while</literal>, |
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50 <literal>do while</literal>, <literal>break</literal>, |
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51 <literal>continue</literal>, <literal>return</literal>, <literal>try</literal>, |
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52 <literal>catch</literal>, <literal>throw</literal>, <literal>finally</literal> |
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53 </listitem> |
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54 |
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55 <listitem> |
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56 ES6 <literal>Number</literal> and |
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57 <literal>Math</literal> properties and methods |
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58 </listitem> |
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59 |
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60 <listitem> |
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61 <literal>String</literal> methods: |
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62 <list type="bullet"> |
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63 |
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64 <listitem> |
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65 ES5.1: |
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66 <literal>fromCharCode</literal>, <literal>concat</literal>, |
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67 <literal>slice</literal>, <literal>substring</literal>, |
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68 <literal>substr</literal>, <literal>charAt</literal>, |
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69 <literal>charCodeAt</literal>, <literal>indexOf</literal>, |
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70 <literal>lastIndexOf</literal>, <literal>toLowerCase</literal>, |
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71 <literal>toUpperCase</literal>, <literal>trim</literal>, |
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72 <literal>search</literal>, <literal>match</literal>, <literal>split</literal>, |
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73 <literal>replace</literal> |
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74 </listitem> |
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75 |
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76 <listitem> |
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77 ES6: |
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78 <literal>fromCodePoint</literal>, <literal>codePointAt</literal>, |
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79 <literal>includes</literal>, <literal>startsWith</literal>, |
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80 <literal>endsWith</literal>, <literal>repeat</literal> |
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81 </listitem> |
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82 |
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83 <listitem> |
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84 non-standard: |
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86 <literal>fromUTF8</literal>, <literal>toUTF8</literal>, |
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87 <literal>fromBytes</literal>, <literal>toBytes</literal> |
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88 </listitem> |
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89 </list> |
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90 |
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91 </listitem> |
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92 |
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93 <listitem> |
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94 <literal>Object</literal> methods: |
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95 <list type="bullet"> |
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96 <listitem> |
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97 ES5.1: |
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98 <literal>create</literal> (support without properties list), |
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99 <literal>keys</literal>, |
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100 <literal>defineProperty</literal>, |
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101 <literal>defineProperties</literal>, |
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102 <literal>getOwnPropertyDescriptor</literal>, |
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103 <literal>getPrototypeOf</literal>, |
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104 <literal>hasOwnProperty</literal>, |
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105 <literal>isPrototypeOf</literal>, |
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106 <literal>preventExtensions</literal>, |
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107 <literal>isExtensible</literal>, |
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108 <literal>freeze</literal>, |
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109 <literal>isFrozen</literal>, |
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110 <literal>seal</literal>, |
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111 <literal>isSealed</literal> |
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112 </listitem> |
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113 </list> |
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114 |
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115 </listitem> |
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116 |
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117 <listitem> |
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118 <literal>Array</literal> methods: |
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119 <list type="bullet"> |
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120 <listitem> |
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121 ES5.1: |
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122 <literal>isArray</literal>, <literal>slice</literal>, <literal>splice</literal>, |
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123 <literal>push</literal>, <literal>pop</literal>, <literal>unshift</literal>, |
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124 <literal>shift</literal>, <literal>reverse</literal>, <literal>sort</literal>, |
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125 <literal>join</literal>, <literal>concat</literal>, <literal>indexOf</literal>, |
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126 <literal>lastIndexOf</literal>, <literal>forEach</literal>, |
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127 <literal>some</literal>, <literal>every</literal>, <literal>filter</literal>, |
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129 <literal>reduceRight</literal> |
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130 </listitem> |
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131 |
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132 <listitem> |
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133 ES6: |
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134 <literal>of</literal>, <literal>fill</literal>, <literal>find</literal>, |
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135 <literal>findIndex</literal> |
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136 </listitem> |
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137 |
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138 <listitem> |
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139 ES7: <literal>includes</literal> |
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140 </listitem> |
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141 </list> |
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142 |
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143 </listitem> |
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144 |
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145 <listitem> |
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146 ES5.1 <literal>Function</literal> methods: |
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147 <literal>call</literal>, <literal>apply</literal>, <literal>bind</literal> |
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148 </listitem> |
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149 |
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150 <listitem> |
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151 ES5.1 <literal>RegExp</literal> methods: |
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152 <literal>test</literal>, <literal>exec</literal> |
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153 </listitem> |
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154 |
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155 <listitem> |
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156 ES5.1 <literal>Date</literal> methods |
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157 </listitem> |
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158 |
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159 <listitem> |
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160 ES5.1 <literal>JSON</literal> object |
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161 </listitem> |
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162 |
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163 <listitem> |
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164 ES5.1 global functions: |
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165 <literal>isFinite</literal>, <literal>isNaN</literal>, |
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166 <literal>parseFloat</literal>, <literal>parseInt</literal>, |
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167 <literal>decodeURI</literal>, <literal>decodeURIComponent</literal>, |
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168 <literal>encodeURI</literal>, <literal>encodeURIComponent</literal> |
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169 </listitem> |
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170 |
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171 <listitem> |
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172 <literal>Error</literal> objects: |
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173 <literal>Error</literal>, <literal>EvalError</literal>, |
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174 <literal>InternalError</literal>, <literal>RangeError</literal>, |
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175 <literal>ReferenceError</literal>, <literal>SyntaxError</literal>, |
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176 <literal>TypeError</literal>, <literal>URIError</literal> |
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177 </listitem> |
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178 |
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179 <listitem> |
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180 <literal>setTimeout()</literal> and <literal>clearTimeout()</literal> functions |
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181 (0.2.0) |
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182 </listitem> |
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183 |
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184 <listitem> |
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185 <link url="https://nodejs.org/api/fs.html#fs_file_system">Node.js style</link> |
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186 <literal>File system</literal> methods: |
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187 <literal>fs.readFile</literal>, <literal>fs.readFileSync</literal>, |
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188 <literal>fs.appendFile</literal>, <literal>fs.appendFileSync</literal>, |
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189 <literal>fs.writeFile</literal>, <literal>fs.writeFileSync</literal> |
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190 </listitem> |
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191 |
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192 <listitem> |
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193 <link url="https://nodejs.org/api/crypto.html#crypto_class_hash">Node.js style</link> |
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194 <literal>Crypto</literal> methods (0.2.0): |
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195 <literal>crypto.createHash</literal>, |
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196 <literal>crypto.createHmac</literal> |
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197 |
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198 </listitem> |
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199 |
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200 </list> |
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201 </para> |
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202 |
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203 </section> |
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204 |
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205 |
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206 <section id="not_supported" name="What is not supported yet"> |
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207 |
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208 <para> |
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209 <list type="bullet"> |
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210 |
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211 <listitem> |
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212 ES6 <literal>let</literal> and <literal>const</literal> declarations |
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213 </listitem> |
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214 |
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215 <listitem> |
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216 labels |
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217 </listitem> |
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218 |
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219 <listitem> |
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220 <literal>arguments</literal> array |
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221 </listitem> |
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222 |
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223 <listitem> |
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224 <literal>eval</literal> function |
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225 </listitem> |
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226 |
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227 <listitem> |
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228 <literal>new Function()</literal> constructor |
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229 </listitem> |
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230 |
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231 <listitem> |
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232 <literal>setInterval</literal>, |
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233 <literal>setImmediate</literal> functions |
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234 </listitem> |
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235 |
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236 <listitem> |
2213 | 237 non-integer fractions (<literal>.235</literal>) |
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238 </listitem> |
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239 |
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240 </list> |
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241 </para> |
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242 |
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243 </section> |
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244 |
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245 |
2130 | 246 <section id="changelog" name="Change Log"> |
247 | |
248 <para> | |
249 The complete list of njs changes is available | |
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250 <link doc="njs_changes.xml">here</link>. |
2130 | 251 </para> |
252 </section> | |
253 | |
254 | |
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255 <section id="njs_api" name="njs API Reference"> |
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256 |
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257 <para> |
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258 njs API reference is available |
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259 <link doc="njs_api.xml">here</link>. |
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260 </para> |
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261 </section> |
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262 |
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263 |
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264 <section id="install" name="Download and install"> |
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265 |
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266 <para> |
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267 njs is available in two modules: |
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268 <list type="bullet"> |
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269 |
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270 <listitem> |
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271 <link doc="../http/ngx_http_js_module.xml">ngx_http_js_module</link> |
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272 </listitem> |
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273 |
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274 <listitem> |
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275 <link doc="../stream/ngx_stream_js_module.xml">ngx_stream_js_module</link> |
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276 </listitem> |
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277 |
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278 </list> |
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279 Both modules are not built by default, |
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280 they should be either compiled from the sources |
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281 or installed as a Linux package. |
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282 In addition, the Linux package provides |
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283 njs command-line <link id="cli">utility</link>. |
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284 </para> |
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285 |
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286 |
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287 <section id="install_package" name="Installing as a Linux package"> |
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288 <para> |
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289 For Linux, njs modules |
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290 <link doc="../../linux_packages.xml" id="dynmodules">packages</link> can be used: |
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291 <list type="bullet"> |
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292 |
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293 <listitem> |
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294 <literal>nginx-module-njs</literal> — njs |
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295 <link doc="../ngx_core_module.xml" id="load_module">dynamic</link> modules |
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296 </listitem> |
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297 |
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298 <listitem> |
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299 <literal>nginx-module-njs-dbg</literal> — debug symbols for the |
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300 <literal>nginx-module-njs</literal> package |
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301 </listitem> |
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302 |
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303 </list> |
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304 </para> |
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305 |
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306 </section> |
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307 |
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308 |
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309 <section id="install_sources" name="Building from the sources"> |
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310 |
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311 <para> |
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312 The <link url="http://hg.nginx.org/njs">repository</link> |
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313 with njs sources can be cloned with the following command: |
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314 (requires <link url="https://www.mercurial-scm.org">Mercurial</link> client): |
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315 <example> |
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316 hg clone http://hg.nginx.org/njs |
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317 </example> |
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318 Then the modules should be compiled using the |
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319 <literal>--add-module</literal> configuration parameter: |
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320 <example> |
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321 ./configure --add-module=<value>path-to-njs</value>/nginx |
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322 </example> |
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323 The modules can also be built as |
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324 <link doc="../ngx_core_module.xml" id="load_module">dynamic</link>: |
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325 <example> |
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326 ./configure --add-dynamic-module=<value>path-to-njs</value>/nginx |
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327 </example> |
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328 </para> |
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329 |
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330 <para> |
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331 To build only njs command-line <link id="cli">utility</link>, run |
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332 <literal>./configure</literal> and <literal>make njs</literal> commands |
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333 from njs root directory. |
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334 The utility is available as <literal>./build/njs</literal>. |
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335 </para> |
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336 |
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337 </section> |
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338 |
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339 </section> |
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340 |
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341 |
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342 <section id="cli" name="Command-line interface"> |
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343 |
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344 <para> |
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345 njs scripts development and debugging can be performed |
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346 from the command-line. |
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347 The command-line utility is available after the installation of |
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348 the Linux <link id="install_package">package</link> |
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349 or after building from the <link id="install_sources">sources</link>. |
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350 Compared to njs running inside nginx, |
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351 nginx objects |
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352 (<link doc="njs_api.xml" id="http">HTTP</link> and |
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353 <link doc="njs_api.xml" id="stream">Stream</link>) |
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354 are not available in the utility. |
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355 <example> |
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356 $ echo "2**3" | njs - |
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357 8 |
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358 |
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359 $ njs |
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360 >> var o = {a:[]} |
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361 undefined |
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362 |
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363 >> JSON.stringify(o, undefined,1) |
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364 { |
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365 "a": [ |
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366 |
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367 ] |
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368 } |
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369 >> |
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370 </example> |
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371 </para> |
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372 |
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373 </section> |
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374 |
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375 </article> |