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/*
枚举属性：指将对象中的所有属性获取
for-in 语句
for(propName in Obj){
语句...
}
注：如果属性名是用symbol()创建的符号，那么用for-in语句是无法枚举的
*/
let obj = {
name: 'zs',
age: 10,
gender: 'man'
}
for (key in obj) {
console.log(key, obj[key])
}
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