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js对象获取属性的方法(.和[]方式)
2022-07-06 07:19:00 【大象与小蚂蚁】
js对象获取属性有两种方法:1.通过.的方式 2. 通过[]方式
// 通过.方式获取属性值,key是静态的
var aa = {
name: "zhang", age: 18};
console.log(aa.name);
// 通过[]获取属性值, key是动态的,可以是字符串,或者数字的形式
var bb = {
"apple": 3, "pear": 2}
var cc = {
1: "number1", 2: "number2"}
console.log(bb["apple"]);
console.log(cc[1]); // 注意这里的写法跟数组容易混淆,cc仍是对象,不是数组
// 获取对象所有key的方法
console.log(Object.keys(bb)); // 输出[ 'apple', 'pear' ]
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