代码拉取完成，页面将自动刷新
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<script>
// let data = { name : 111,data2:{name:2222},length:11}
// let a = [data]
// let obj = Object.assign({},data)
// let newArr = Array.from( '111')
// console.log(newArr);
// // console.log(newArr[0].data2.name);
// // let obj = data
// console.log(obj);
// obj.name = 222
// obj.data2.name = 33333
// console.log(data);
// // obj.name = 'qwq'
// // console.log(obj);
// let list = []
// list.push(data)
// // console.log(list);
// let arr = [{name:2222}]
// const arr1 = arr.from(data)
// const arr2 = arr.from()
// arr1[1].data2.name =3333
// arr2.push(data)
// console.log('arr2',arr2,'arr',arr);
// let q = 'qqq'
// const w =q.concat(data)
// console.log(w);
// console.log(arr1,'2',arr2);
const hiddenMobileNumber = (str) => {
// return str.slice(0, 3) + '****' + str.slice(-4);
// return str.replace(str.slice(3,7),'****')
// 正则替换，编组() 与 $n
return str.replace(/(\d{3})(\d{4})(\d{4})/,'$1****$3')
};
console.log(hiddenMobileNumber('17520581693'));
</script>
<!-- <script type="text/javascript">
// 浅拷贝
let obj = {
name:'海鱼',
age:17
}
function copyObj(obj){
let obj2 = {}
for(let key in obj){
obj2[key] = obj[key]
}
return obj2
}
let obj2 = copyObj(obj)
console.log(obj2)
// 深拷贝
let obj3 = {
name:'欧健多多',
age:17,
habby:{
sport:'run',
games:'DNF'
}
}
function deepCopyobj(obj3){
let obj4 = {}
for(let key in obj3){
obj4[key] = typeof obj3[key] == 'object' ? deepCopyobj(obj3[key]) : obj3[key]
}
return obj4
}
let obj5 = deepCopyobj(obj3)
console.log(obj5)
</script> -->
</body>
</html>
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