Map.prototype.size

¥Description

size 的值是一个整数，表示 Map 对象有多少个条目。size 的设置访问器函数是 undefined；你无法更改此属性。

¥The value of size is an integer representing how many entries the Map object has. A set accessor function for size is undefined; you can not change this property.

¥Examples

¥Using size

const myMap = new Map();
myMap.set("a", "alpha");
myMap.set("b", "beta");
myMap.set("g", "gamma");

console.log(myMap.size); // 3

¥See also

• Map