JS map clear()
clear()
方法会移除Map对象中的所有元素。
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语法
myMap.clear();
返回值
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)Map.prototype.clear | Standard | Initial definition. |
ECMAScript Latest Draft (ECMA-262)Map.prototype.clear | Draft |