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JavaScript 參考文件
Web/JavaScript/Reference

{{JsSidebar}}

在 MDN 的 JavaScript 分區中，這一部分被作爲 Javascript 的資料庫。閱讀關於該參考以了解更多。

全域物件

本章節記錄了所有 JavaScript 標準內建物件 以及其方法與屬性。

數值屬性

  • {{JSxRef("Infinity")}}
  • {{JSxRef("NaN")}}
  • {{JSxRef("undefined")}}
  • {{JSxRef("globalThis")}}

函數屬性

  • {{JSxRef("Global_Objects/eval", "eval()")}}
  • {{JSxRef("Global_Objects/isFinite", "isFinite()")}}
  • {{JSxRef("Global_Objects/isNaN", "isNaN()")}}
  • {{JSxRef("Global_Objects/parseFloat", "parseFloat()")}}
  • {{JSxRef("Global_Objects/parseInt", "parseInt()")}}
  • {{JSxRef("Global_Objects/decodeURI", "decodeURI()")}}
  • {{JSxRef("Global_Objects/decodeURIComponent", "decodeURIComponent()")}}
  • {{JSxRef("Global_Objects/encodeURI", "encodeURI()")}}
  • {{JSxRef("Global_Objects/encodeURIComponent", "encodeURIComponent()")}}

基礎物件

  • {{JSxRef("Object")}}
  • {{JSxRef("Function")}}
  • {{JSxRef("Boolean")}}
  • {{JSxRef("Symbol")}}

Error

  • {{JSxRef("Error")}}
  • {{JSxRef("AggregateError")}}
  • {{JSxRef("EvalError")}}
  • {{JSxRef("InternalError")}}
  • {{JSxRef("RangeError")}}
  • {{JSxRef("ReferenceError")}}
  • {{JSxRef("SyntaxError")}}
  • {{JSxRef("TypeError")}}
  • {{JSxRef("URIError")}}

數字與日期

  • {{JSxRef("Number")}}
  • {{JSxRef("BigInt")}}
  • {{JSxRef("Math")}}
  • {{JSxRef("Date")}}

文字處理

  • {{JSxRef("String")}}
  • {{JSxRef("RegExp")}}

具索引的集合

  • {{JSxRef("Array")}}
  • {{JSxRef("Int8Array")}}
  • {{JSxRef("Uint8Array")}}
  • {{JSxRef("Uint8ClampedArray")}}
  • {{JSxRef("Int16Array")}}
  • {{JSxRef("Uint16Array")}}
  • {{JSxRef("Int32Array")}}
  • {{JSxRef("Uint32Array")}}
  • {{JSxRef("Float32Array")}}
  • {{JSxRef("Float64Array")}}
  • {{JSxRef("BigInt64Array")}}
  • {{JSxRef("BigUint64Array")}}

具鍵值的集合

  • {{JSxRef("Map")}}
  • {{JSxRef("Set")}}
  • {{JSxRef("WeakMap")}}
  • {{JSxRef("WeakSet")}}

結構化資料

  • {{JSxRef("ArrayBuffer")}}
  • {{JSxRef("SharedArrayBuffer")}}
  • {{JSxRef("Atomics")}}
  • {{JSxRef("DataView")}}
  • {{JSxRef("JSON")}}

控制抽象化物件

  • {{JSxRef("Promise")}}
  • {{JSxRef("Generator")}}
  • {{JSxRef("GeneratorFunction")}}
  • {{JSxRef("AsyncFunction")}}

Reflection

  • {{JSxRef("Reflect")}}
  • {{JSxRef("Proxy")}}

國際化

  • {{JSxRef("Intl")}}
  • {{JSxRef("Global_Objects/Collator", "Intl.Collator")}}
  • {{JSxRef("Global_Objects/DateTimeFormat", "Intl.DateTimeFormat")}}
  • {{JSxRef("Global_Objects/ListFormat", "Intl.ListFormat")}}
  • {{JSxRef("Global_Objects/NumberFormat", "Intl.NumberFormat")}}
  • {{JSxRef("Global_Objects/PluralRules", "Intl.PluralRules")}}
  • {{JSxRef("Global_Objects/RelativeTimeFormat", "Intl.RelativeTimeFormat")}}
  • {{JSxRef("Global_Objects/Locale", "Intl.Locale")}}

WebAssembly

  • {{JSxRef("WebAssembly")}}
  • {{JSxRef("WebAssembly.Module")}}
  • {{JSxRef("WebAssembly.Instance")}}
  • {{JSxRef("WebAssembly.Memory")}}
  • {{JSxRef("WebAssembly.Table")}}
  • {{JSxRef("WebAssembly.CompileError")}}
  • {{JSxRef("WebAssembly.LinkError")}}
  • {{JSxRef("WebAssembly.RuntimeError")}}

敘述句

本章節記錄了所有 JavaScript 敘述句與宣告。

流程控制

  • {{jsxref("Statements/block", "Block")}}
  • {{jsxref("Statements/break", "break")}}
  • {{jsxref("Statements/continue", "continue")}}
  • {{jsxref("Statements/Empty", "Empty")}}
  • {{jsxref("Statements/if...else", "if...else")}}
  • {{jsxref("Statements/switch", "switch")}}
  • {{jsxref("Statements/throw", "throw")}}
  • {{jsxref("Statements/try...catch", "try...catch")}}

宣告

  • {{jsxref("Statements/var", "var")}}
  • {{jsxref("Statements/let", "let")}}
  • {{jsxref("Statements/const", "const")}}

函數與類別

  • {{jsxref("Statements/function", "function")}}
  • {{jsxref("Statements/function*", "function*")}}
  • {{jsxref("Statements/async_function", "async function")}}
  • {{jsxref("Statements/return", "return")}}
  • {{jsxref("Statements/class", "class")}}

迭代

  • {{jsxref("Statements/do...while", "do...while")}}
  • {{jsxref("Statements/for", "for")}}
  • {{jsxref("Statements/for...in", "for...in")}}
  • {{jsxref("Statements/for...of", "for...of")}}
  • {{jsxref("Statements/for-await...of", "for await...of")}}
  • {{jsxref("Statements/while", "while")}}

Other

  • {{jsxref("Statements/debugger", "debugger")}}
  • {{jsxref("Statements/import", "import")}}
  • {{jsxref("Statements/label", "label")}}
  • {{jsxref("Statements/with", "with")}}

表示法與運算子

本章節記錄了所有 JavaScript 表示法與運算子。

主要運算式

  • {{JSxRef("Operators/this", "this")}}
  • {{JSxRef("Operators/function", "function")}}
  • {{JSxRef("Operators/class", "class")}}
  • {{JSxRef("Operators/function*", "function*")}}
  • {{JSxRef("Operators/yield", "yield")}}
  • {{JSxRef("Operators/yield*", "yield*")}}
  • {{JSxRef("Operators/async_function", "async function")}}
  • {{JSxRef("Operators/await", "await")}}
  • {{JSxRef("Global_Objects/Array", "[]")}}
  • {{JSxRef("Operators/Object_initializer", "{}")}}
  • {{JSxRef("Global_Objects/RegExp", "/ab+c/i")}}
  • {{JSxRef("Operators/Grouping", "( )")}}
  • {{JSxRef("null")}}

左手邊運算式

  • {{JSxRef("Operators/Property_accessors", "Property accessors", "", 1)}}
  • {{JSxRef("Operators/new", "new")}}
  • {{JSxRef("Operators/new%2Etarget", "new.target")}}
  • {{JSxRef("Operators/super", "super")}}
  • {{JSxRef("Operators/Spread_syntax", "...obj")}}

遞增與遞減

  • {{JSxRef("Operators/Arithmetic_Operators", "A++", "#Increment")}}
  • {{JSxRef("Operators/Arithmetic_Operators", "A--", "#Decrement")}}
  • {{JSxRef("Operators/Arithmetic_Operators", "++A", "#Increment")}}
  • {{JSxRef("Operators/Arithmetic_Operators", "--A", "#Decrement")}}

一元運算子

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

算術運算子

  • {{JSxRef("Operators/Arithmetic_Operators", "+", "#Addition")}}
  • {{JSxRef("Operators/Arithmetic_Operators", "-", "#Subtraction")}}
  • {{JSxRef("Operators/Arithmetic_Operators", "/", "#Division")}}
  • {{JSxRef("Operators/Arithmetic_Operators", "*", "#Multiplication")}}
  • {{JSxRef("Operators/Arithmetic_Operators", "%", "#Remainder")}}
  • {{JSxRef("Operators/Arithmetic_Operators", "**", "#Exponentiation")}}

關係運算子

  • {{JSxRef("Operators/in", "in")}}
  • {{JSxRef("Operators/instanceof", "instanceof")}}
  • {{JSxRef("Operators/Comparison_Operators", "<", "#Less_than_operator")}}
  • {{JSxRef("Operators/Comparison_Operators", ">", "#Greater_than_operator")}}
  • {{JSxRef("Operators/Comparison_Operators", "<=", "#Less_than_or_equal_operator")}}
  • {{JSxRef("Operators/Comparison_Operators", ">=", "#Greater_than_or_equal_operator")}}

相等運算子

  • {{JSxRef("Operators/Comparison_Operators", "==", "#Equality")}}
  • {{JSxRef("Operators/Comparison_Operators", "!=", "#Inequality")}}
  • {{JSxRef("Operators/Comparison_Operators", "===", "#Identity")}}
  • {{JSxRef("Operators/Comparison_Operators", "!==", "#Nonidentity")}}

位元移位運算子

  • {{JSxRef("Operators/Bitwise_Operators", "<<", "#Left_shift")}}
  • {{JSxRef("Operators/Bitwise_Operators", ">>", "#Right_shift")}}
  • {{JSxRef("Operators/Bitwise_Operators", ">>>", "#Unsigned_right_shift")}}

二元位元運算子

  • {{JSxRef("Operators/Bitwise_Operators", "&", "#Bitwise_AND")}}
  • {{JSxRef("Operators/Bitwise_Operators", "|", "#Bitwise_OR")}}
  • {{JSxRef("Operators/Bitwise_Operators", "^", "#Bitwise_XOR")}}

二元邏輯運算子

  • {{JSxRef("Operators/Logical_Operators", "&&", "#Logical_AND")}}
  • {{JSxRef("Operators/Logical_Operators", "||", "#Logical_OR")}}

條件(三元)運算子

  • {{JSxRef("Operators/Conditional_Operator", "(condition ? ifTrue : ifFalse)")}}

賦值運算子

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

函數

本章節說明如何使用 JavaScript 函數 來開發你的應用程式。

其他參考頁面