map.clear
clear()方法会移除Map对象中的所有元素。
语法
myMap.clear();返回值
undefined.
示例
调用clear方法
var myMap = new Map();
myMap.set('bar', 'baz');
myMap.set(1, 'foo');
myMap.size; // 2
myMap.has('bar'); // true
myMap.clear();
myMap.size; // 0
myMap.has('bar') // false规范
Specification | Status | Comment |
|---|---|---|
ECMAScript 2015 (6th Edition, ECMA-262)The definition of 'Map.prototype.clear' in that specification. | Standard | Initial definition. |
ECMAScript Latest Draft (ECMA-262)The definition of 'Map.prototype.clear' in that specification. | Draft | ? |
浏览器兼容性
Feature | Chrome | Edge | Firefox (Gecko) | Internet Explorer | Opera | Safari |
|---|---|---|---|---|---|---|
Basic support | 38 | (Yes) | 19.0 (19.0) | 11 | 25 | 7.1 |
Feature | Android | Chrome for Android | Edge | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile |
|---|---|---|---|---|---|---|---|
Basic support | No support | 38 | (Yes) | 19.0 (19.0) | No support | No support | 8 |
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