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

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

浏览器兼容

相关链接

• Map