map.clear
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 |
