toString()
方法返回指定的布尔对象的字符串形式。
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bool.toString()
表示特定Boolean
对象的字符串。
Boolean
对象覆盖了 Object
对象的 toString
方法。并没有继承 Object.prototype.toString()
。对于布尔对象,toString
方法返回该对象的字符串形式。
当一个Boolean
对象作为文本值或进行字符串连接时,JavaScript 会自动调用其 toString
方法。
对于Boolean
对象或值,内置的 toString
方法返回字符串 "true
" 或 "false
",具体返回哪个取决于布尔对象的值。
toString
下面的代码,flag.toString
返回 "true
":
var flag = new Boolean(true)
var myVar = flag.toString()
Specification | Status | Comment |
---|---|---|
ECMAScript 1st Edition (ECMA-262) | Standard | Initial definition. |
ECMAScript 5.1 (ECMA-262) Boolean.prototype.toString |
Standard | |
ECMAScript 2015 (6th Edition, ECMA-262) Boolean.prototype.toString |
Standard | |
ECMAScript Latest Draft (ECMA-262) Boolean.prototype.toString |
Draft |
Desktop | Mobile | Server | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
toString | Chrome Full support Yes | Edge Full support 12 | Firefox Full support 1 | IE Full support Yes | Opera Full support Yes | Safari Full support Yes | WebView Android Full support Yes | Chrome Android Full support Yes | Edge Mobile Full support Yes | Firefox Android Full support 4 | Opera Android Full support Yes | Safari iOS Full support Yes | Samsung Internet Android Full support Yes | nodejs Full support Yes |