clear()
方法会移除Map对象中的所有元素。
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myMap.clear();
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
Specification | Status | Comment |
---|---|---|
ECMAScript 2015 (6th Edition, ECMA-262) Map.prototype.clear |
Standard | Initial definition. |
ECMAScript Latest Draft (ECMA-262) Map.prototype.clear |
Draft |
Desktop | Mobile | Server | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
clear | Chrome Full support 38 | Edge Full support 12 | Firefox Full support 19 | IE Full support 11 | Opera Full support 25 | Safari Full support 8 | WebView Android Full support 38 | Chrome Android Full support 38 | Edge Mobile Full support 12 | Firefox Android Full support 19 | Opera Android Full support 25 | Safari iOS Full support 8 | Samsung Internet Android Full support Yes | nodejs Full support 0.12 |