//delete方法是从对象中删除键值对
delete obj.cname;
console.log(obj);//{age: 18}
//in 判断对象是否包含一个 语法:key in obj 返回一个布尔值
console.log("age" in obj) //true
//for in 快速遍历
var obj2 = {
age:18,
add:"中国",
cname:"凉白开"
}
for(var i in obj2) {
console.log(i) // key
console.log(obj2[i]) //输出值
}
网友评论