---
title: JavaScript 参考
slug: Web/JavaScript/Reference
tags:
  - ECMAScript
  - JS
  - JavaScript
  - 参考
translation_of: Web/JavaScript/Reference
---
<div>{{JsSidebar}}</div>

<div>在 MDN 的 JavaScript 分区中，这一部分被作为 Javascript 的资料库。阅读<a href="/zh-CN/docs/Web/JavaScript/Reference/About">关于该参考</a>以了解更多。</div>

<h2 id="内置">内置</h2>

<p>{{JSxRef("Global_Objects", "JavaScript 标准内置对象")}}, 以及他们的方法和属性.</p>

<ul class="card-grid">
 <li>
  <h4 id="值属性">值属性</h4>

  <ul>
   <li>{{JSxRef("Infinity")}}</li>
   <li>{{JSxRef("NaN")}}</li>
   <li>{{JSxRef("undefined")}}</li>
   <li>{{JSxRef("globalThis")}}</li>
  </ul>
 </li>
 <li>
  <h4 id="Function_属性">Function 属性</h4>

  <ul>
   <li>{{JSxRef("Global_Objects/eval", "eval()")}}</li>
   <li>{{JSxRef("Global_Objects/isFinite", "isFinite()")}}</li>
   <li>{{JSxRef("Global_Objects/isNaN", "isNaN()")}}</li>
   <li>{{JSxRef("Global_Objects/parseFloat", "parseFloat()")}}</li>
   <li>{{JSxRef("Global_Objects/parseInt", "parseInt()")}}</li>
   <li>{{JSxRef("Global_Objects/decodeURI", "decodeURI()")}}</li>
   <li>{{JSxRef("Global_Objects/decodeURIComponent", "decodeURIComponent()")}}</li>
   <li>{{JSxRef("Global_Objects/encodeURI", "encodeURI()")}}</li>
   <li>{{JSxRef("Global_Objects/encodeURIComponent", "encodeURIComponent()")}}</li>
  </ul>
 </li>
 <li>
  <h4 id="基本对象">基本对象</h4>

  <ul>
   <li>{{JSxRef("Object")}}</li>
   <li>{{JSxRef("Function")}}</li>
   <li>{{JSxRef("Boolean")}}</li>
   <li>{{JSxRef("Symbol")}}</li>
  </ul>
 </li>
 <li>
  <h4 id="错误对象">错误对象</h4>

  <ul>
   <li>{{JSxRef("Error")}}</li>
   <li>{{JSxRef("AggregateError")}}</li>
   <li>{{JSxRef("EvalError")}}</li>
   <li>{{JSxRef("InternalError")}}</li>
   <li>{{JSxRef("RangeError")}}</li>
   <li>{{JSxRef("ReferenceError")}}</li>
   <li>{{JSxRef("SyntaxError")}}</li>
   <li>{{JSxRef("TypeError")}}</li>
   <li>{{JSxRef("URIError")}}</li>
  </ul>
 </li>
</ul>

<ul class="card-grid">
 <li>
  <h4 id="Numbers_dates">Numbers &amp; dates</h4>

  <ul>
   <li>{{JSxRef("Number")}}</li>
   <li>{{JSxRef("BigInt")}}</li>
   <li>{{JSxRef("Math")}}</li>
   <li>{{JSxRef("Date")}}</li>
  </ul>
 </li>
 <li>
  <h4 id="文本处理">文本处理</h4>

  <ul>
   <li>{{JSxRef("String")}} {{JSxRef("RegExp")}}</li>
  </ul>
 </li>
 <li>
  <h4 id="索引集合类">索引集合类</h4>

  <ul>
   <li>{{JSxRef("Array")}}</li>
   <li>{{JSxRef("Int8Array")}}</li>
   <li>{{JSxRef("Uint8Array")}}</li>
   <li>{{JSxRef("Uint8ClampedArray")}}</li>
   <li>{{JSxRef("Int16Array")}}</li>
   <li>{{JSxRef("Uint16Array")}}</li>
   <li>{{JSxRef("Int32Array")}}</li>
   <li>{{JSxRef("Uint32Array")}}</li>
   <li>{{JSxRef("Float32Array")}}</li>
   <li>{{JSxRef("Float64Array")}}</li>
   <li>{{JSxRef("BigInt64Array")}}</li>
   <li>{{JSxRef("BigUint64Array")}}</li>
  </ul>
 </li>
 <li>
  <h4 id="Keyed_collections">Keyed collections</h4>

  <ul>
   <li>{{JSxRef("Map")}}</li>
   <li>{{JSxRef("Set")}}</li>
   <li>{{JSxRef("WeakMap")}}</li>
   <li>{{JSxRef("WeakSet")}}</li>
  </ul>
 </li>
</ul>

<ul class="card-grid">
 <li>
  <h4 id="结构化数据">结构化数据</h4>

  <ul>
   <li>{{JSxRef("ArrayBuffer")}}</li>
   <li>{{JSxRef("SharedArrayBuffer")}}</li>
   <li>{{JSxRef("Atomics")}}</li>
   <li>{{JSxRef("DataView")}}</li>
   <li>{{JSxRef("JSON")}}</li>
  </ul>
 </li>
 <li>
  <h4 id="控制抽象化">控制抽象化</h4>

  <ul>
   <li>{{JSxRef("Promise")}}</li>
   <li>{{JSxRef("Generator")}}</li>
   <li>{{JSxRef("GeneratorFunction")}}</li>
   <li>{{JSxRef("AsyncFunction")}}</li>
  </ul>
 </li>
 <li>
  <h4 id="反射">反射</h4>

  <ul>
   <li>{{JSxRef("Reflect")}}</li>
   <li>{{JSxRef("Proxy")}}</li>
  </ul>
 </li>
 <li>
  <h4 id="国际化">国际化</h4>

  <ul>
   <li>{{JSxRef("Intl")}}</li>
   <li>{{JSxRef("Global_Objects/Intl/Collator", "Intl.Collator")}}</li>
   <li>{{JSxRef("Global_Objects/Intl/DateTimeFormat", "Intl.DateTimeFormat")}}</li>
   <li>{{JSxRef("Global_Objects/Intl/DisplayNames", "Intl.DisplayNames")}}</li>
   <li>{{JSxRef("Global_Objects/Intl/ListFormat", "Intl.ListFormat")}}</li>
   <li>{{JSxRef("Global_Objects/Intl/Locale", "Intl.Locale")}}</li>
   <li>{{JSxRef("Global_Objects/Intl/NumberFormat", "Intl.NumberFormat")}}</li>
   <li>{{JSxRef("Global_Objects/Intl/PluralRules", "Intl.PluralRules")}}</li>
   <li>{{JSxRef("Global_Objects/Intl/RelativeTimeFormat", "Intl.RelativeTimeFormat")}}</li>
  </ul>
 </li>
</ul>

<ul class="card-grid">
 <li><span>WebAssembly</span>

  <ul>
   <li>{{JSxRef("WebAssembly")}}</li>
   <li>{{JSxRef("WebAssembly.Module")}}</li>
   <li>{{JSxRef("WebAssembly.Instance")}}</li>
   <li>{{JSxRef("WebAssembly.Memory")}}</li>
   <li>{{JSxRef("WebAssembly.Table")}}</li>
   <li>{{JSxRef("WebAssembly.CompileError")}}</li>
   <li>{{JSxRef("WebAssembly.LinkError")}}</li>
   <li>{{JSxRef("WebAssembly.RuntimeError")}}</li>
  </ul>
 </li>
</ul>

<h2 id="语句">语句</h2>

<p>{{JSxRef("Statements", "语句和声明")}}</p>

<ul class="card-grid">
 <li>
  <h4 id="控制流">控制流</h4>

  <ul>
   <li>{{jsxref("Statements/block", "Block")}}</li>
   <li>{{jsxref("Statements/break", "break")}}</li>
   <li>{{jsxref("Statements/continue", "continue")}}</li>
   <li>{{jsxref("Statements/Empty", "Empty")}}</li>
   <li>{{jsxref("Statements/if...else", "if...else")}}</li>
   <li>{{jsxref("Statements/switch", "switch")}}</li>
   <li>{{jsxref("Statements/throw", "throw")}}</li>
   <li>{{jsxref("Statements/try...catch", "try...catch")}}</li>
  </ul>
 </li>
 <li>
  <h4 id="声明">声明</h4>

  <ul>
   <li>{{jsxref("Statements/var", "var")}}</li>
   <li>{{jsxref("Statements/let", "let")}}</li>
   <li>{{jsxref("Statements/const", "const")}}</li>
  </ul>
 </li>
 <li>
  <h4 id="函数和类">函数和类</h4>

  <ul>
   <li>{{jsxref("Statements/function", "function")}}</li>
   <li>{{jsxref("Statements/function*", "function*")}}</li>
   <li>{{jsxref("Statements/async_function", "async function")}}</li>
   <li>{{jsxref("Statements/return", "return")}}</li>
   <li>{{jsxref("Statements/class", "class")}}</li>
  </ul>
 </li>
 <li>
  <h4 id="迭代">迭代</h4>

  <ul>
   <li>{{jsxref("Statements/do...while", "do...while")}}</li>
   <li>{{jsxref("Statements/for", "for")}}</li>
   <li>{{jsxref("Statements/for_each...in", "for each...in")}}</li>
   <li>{{jsxref("Statements/for...in", "for...in")}}</li>
   <li>{{jsxref("Statements/for...of", "for...of")}}</li>
   <li>{{jsxref("Statements/for-await...of", "for await...of")}}</li>
   <li>{{jsxref("Statements/while", "while")}}</li>
  </ul>
 </li>
</ul>

<ul class="card-grid">
 <li>
  <h4 id="其他">其他</h4>

  <ul>
   <li>{{jsxref("Statements/debugger", "debugger")}}</li>
   <li>{{jsxref("Statements/import", "import")}}</li>
   <li>{{jsxref("Statements/label", "label")}}</li>
   <li>{{jsxref("Statements/with", "with")}}</li>
  </ul>
 </li>
</ul>

<h2 id="表达式和运算符">表达式和运算符</h2>

<p>{{JSxRef("Operators", "表达式和运算符")}}. </p>

<div>
<ul class="card-grid">
 <li>
  <h4 id="Primary_expressions">Primary expressions</h4>

  <ul>
   <li>{{JSxRef("Operators/this", "this")}}</li>
   <li>{{JSxRef("Operators/function", "function")}}</li>
   <li>{{JSxRef("Operators/class", "class")}}</li>
   <li>{{JSxRef("Operators/function*", "function*")}}</li>
   <li>{{JSxRef("Operators/yield", "yield")}}</li>
   <li>{{JSxRef("Operators/yield*", "yield*")}}</li>
   <li>{{JSxRef("Operators/async_function", "async function")}}</li>
   <li>{{JSxRef("Operators/await", "await")}}</li>
   <li>{{JSxRef("Global_Objects/Array", "[]")}}</li>
   <li>{{JSxRef("Operators/Object_initializer", "{}")}}</li>
   <li>{{JSxRef("Global_Objects/RegExp", "/ab+c/i")}}</li>
   <li>{{JSxRef("Operators/Grouping", "( )")}}</li>
   <li>{{JSxRef("null")}}</li>
  </ul>
 </li>
 <li>
  <h4 id="Left-hand-side_expressions">Left-hand-side expressions</h4>

  <ul>
   <li>{{JSxRef("Operators/Property_accessors", "Property accessors", "", 1)}}</li>
   <li>{{JSxRef("Operators/new", "new")}}</li>
   <li>{{JSxRef("Operators/new%2Etarget", "new.target")}}</li>
   <li>{{JSxRef("Operators/super", "super")}}</li>
   <li>{{JSxRef("Operators/Spread_syntax", "...obj")}}</li>
  </ul>
 </li>
 <li>
  <h4 id="Increment_decrement">Increment &amp; decrement</h4>

  <ul>
   <li>{{JSxRef("Operators/Arithmetic_Operators", "A++", "#Increment")}}</li>
   <li>{{JSxRef("Operators/Arithmetic_Operators", "A--", "#Decrement")}}</li>
   <li>{{JSxRef("Operators/Arithmetic_Operators", "++A", "#Increment")}}</li>
   <li>{{JSxRef("Operators/Arithmetic_Operators", "--A", "#Decrement")}}</li>
  </ul>
 </li>
 <li>
  <h4 id="一元运算符">一元运算符</h4>

  <ul>
   <li>{{JSxRef("Operators/delete", "delete")}}</li>
   <li>{{JSxRef("Operators/void", "void")}}</li>
   <li>{{JSxRef("Operators/typeof", "typeof")}}</li>
   <li>{{JSxRef("Operators/Arithmetic_Operators", "+", "#Unary_plus")}}</li>
   <li>{{JSxRef("Operators/Arithmetic_Operators", "-", "#Unary_negation")}}</li>
   <li>{{JSxRef("Operators/Bitwise_Operators", "~", "#Bitwise_NOT")}}</li>
   <li>{{JSxRef("Operators/Logical_Operators", "!", "#Logical_NOT")}}</li>
  </ul>
 </li>
</ul>

<ul class="card-grid">
 <li>
  <h4 id="算术运算符">算术运算符</h4>

  <ul>
   <li>{{JSxRef("Operators/Arithmetic_Operators", "+", "#Addition")}}</li>
   <li>{{JSxRef("Operators/Arithmetic_Operators", "-", "#Subtraction")}}</li>
   <li>{{JSxRef("Operators/Arithmetic_Operators", "/", "#Division")}}</li>
   <li>{{JSxRef("Operators/Arithmetic_Operators", "*", "#Multiplication")}}</li>
   <li>{{JSxRef("Operators/Arithmetic_Operators", "%", "#Remainder")}}</li>
   <li>{{JSxRef("Operators/Arithmetic_Operators", "**", "#Exponentiation")}}</li>
  </ul>
 </li>
 <li>
  <h4 id="关系运算符">关系运算符</h4>

  <ul>
   <li>{{JSxRef("Operators/in", "in")}}</li>
   <li>{{JSxRef("Operators/instanceof", "instanceof")}}</li>
   <li>{{JSxRef("Operators/Comparison_Operators", "&lt;", "#Less_than_operator")}}</li>
   <li>{{JSxRef("Operators/Comparison_Operators", "&gt;", "#Greater_than_operator")}}</li>
   <li>{{JSxRef("Operators/Comparison_Operators", "&lt;=", "#Less_than_or_equal_operator")}}</li>
   <li>{{JSxRef("Operators/Comparison_Operators", "&gt;=", "#Greater_than_or_equal_operator")}}</li>
  </ul>
 </li>
 <li>
  <h4 id="相等运算符">相等运算符</h4>

  <ul>
   <li>{{JSxRef("Operators/Comparison_Operators", "==", "#Equality")}}</li>
   <li>{{JSxRef("Operators/Comparison_Operators", "!=", "#Inequality")}}</li>
   <li>{{JSxRef("Operators/Comparison_Operators", "===", "#Identity")}}</li>
   <li>{{JSxRef("Operators/Comparison_Operators", "!==", "#Nonidentity")}}</li>
  </ul>
 </li>
 <li>
  <h4 id="位移运算符">位移运算符</h4>

  <ul>
   <li>{{JSxRef("Operators/Bitwise_Operators", "&lt;&lt;", "#Left_shift")}}</li>
   <li>{{JSxRef("Operators/Bitwise_Operators", "&gt;&gt;", "#Right_shift")}}</li>
   <li>{{JSxRef("Operators/Bitwise_Operators", "&gt;&gt;&gt;", "#Unsigned_right_shift")}}</li>
  </ul>
 </li>
</ul>

<ul class="card-grid">
 <li>
  <h4 id="位运算">位运算</h4>

  <ul>
   <li>{{JSxRef("Operators/Bitwise_Operators", "&amp;", "#Bitwise_AND")}}</li>
   <li>{{JSxRef("Operators/Bitwise_Operators", "|", "#Bitwise_OR")}}</li>
   <li>{{JSxRef("Operators/Bitwise_Operators", "^", "#Bitwise_XOR")}}</li>
  </ul>
 </li>
 <li>
  <h4 id="逻辑运算">逻辑运算</h4>

  <ul>
   <li>{{JSxRef("Operators/Logical_Operators", "&amp;&amp;", "#Logical_AND")}}</li>
   <li>{{JSxRef("Operators/Logical_Operators", "||", "#Logical_OR")}}</li>
  </ul>
 </li>
 <li>
  <h4 id="条件运算符">条件运算符</h4>

  <ul>
   <li>{{JSxRef("Operators/Conditional_Operator", "(condition ? ifTrue : ifFalse)")}}</li>
  </ul>
 </li>
 <li>
  <h4 id="赋值操作符">赋值操作符</h4>

  <ul>
   <li>{{JSxRef("Operators/Assignment_Operators", "=", "#Assignment")}}</li>
   <li>{{JSxRef("Operators/Assignment_Operators", "*=", "#Multiplication_assignment")}}</li>
   <li>{{JSxRef("Operators/Assignment_Operators", "/=", "#Division_assignment")}}</li>
   <li>{{JSxRef("Operators/Assignment_Operators", "%=", "#Remainder_assignment")}}</li>
   <li>{{JSxRef("Operators/Assignment_Operators", "+=", "#Addition_assignment")}}</li>
   <li>{{JSxRef("Operators/Assignment_Operators", "-=", "#Subtraction_assignment")}}</li>
   <li>{{JSxRef("Operators/Assignment_Operators", "&lt;&lt;=", "#Left_shift_assignment")}}</li>
   <li>{{JSxRef("Operators/Assignment_Operators", "&gt;&gt;=", "#Right_shift_assignment")}}</li>
   <li>{{JSxRef("Operators/Assignment_Operators", "&gt;&gt;&gt;=", "#Unsigned_right_shift_assignment")}}</li>
   <li>{{JSxRef("Operators/Assignment_Operators", "&amp;=", "#Bitwise_AND_assignment")}}</li>
   <li>{{JSxRef("Operators/Assignment_Operators", "^=", "#Bitwise_XOR_assignment")}}</li>
   <li>{{JSxRef("Operators/Assignment_Operators", "|=", "#Bitwise_OR_assignment")}}</li>
   <li>{{JSxRef("Operators/Destructuring_assignment", "[a, b] = [1, 2]")}}</li>
   <li>{{JSxRef("Operators/Destructuring_assignment", "{a, b} = {a:1, b:2}")}}</li>
  </ul>
 </li>
</ul>
</div>

<h2 id="函数">函数</h2>

<p>本章介绍如何使用 <a href="/zh-CN/docs/Web/JavaScript/Reference/Functions">JavaScript函数</a> 来开发应用程序。</p>

<ul>
 <li><a href="/zh-CN/docs/Web/JavaScript/Reference/Functions/arguments"><code>arguments</code></a></li>
 <li><a href="/zh-CN/docs/Web/JavaScript/Reference/Functions/Arrow_functions">箭头函数</a></li>
 <li><a href="/zh-CN/docs/Web/JavaScript/Reference/Functions/Default_parameters">默认参数</a></li>
 <li><a href="/zh-CN/docs/Web/JavaScript/Reference/Functions/rest_parameters">剩余参数</a></li>
</ul>

<h2 id="附加参考页面">附加参考页面</h2>

<ul>
 <li><a href="/zh-CN/docs/Web/JavaScript/Reference/Lexical_grammar">词法文法</a></li>
 <li><a href="/zh-CN/docs/Web/JavaScript/Data_structures">数据类型和数据结构</a></li>
 <li><a href="/zh-CN/docs/Web/JavaScript/Reference/Strict_mode">严格模式</a></li>
 <li><a href="/zh-CN/docs/Web/JavaScript/Reference/Deprecated_and_obsolete_features">过时的特性</a></li>
</ul>