js深拷贝案例

tomcat2022 / 2023-09-03 / 原文

<!DOCTYPE html>
<html class="no-js">
    <head>
        <meta charset="utf-8" />
        <meta http-equiv="X-UA-Compatible" content="IE=edge" />
        <title></title>
        <meta name="description" content="" />
        <meta name="viewport" content="width=device-width, initial-scale=1" />
        <link rel="stylesheet" href="" />
    </head>
    <style>
        .item{
            color:red;
            background-color: antiquewhite;
            border:1px solid burlywood;
            width:100px;
            height:300px;
        }
    </style>
    <body>
       <div></div>
       
    </body>

    <script>
        const obj={
            uname:'pink',
            age:18,
        }
        const o={}
        function deepCopy(newObj,oldObj){
            for(let k in oldObj){
                newObj[k]=oldObj[k];
            }
        }
        deepCopy(o,obj)
        console.log(o);
    </script>
</html>

带数组模式的的深拷贝

<!DOCTYPE html>
<html class="no-js">
    <head>
        <meta charset="utf-8" />
        <meta http-equiv="X-UA-Compatible" content="IE=edge" />
        <title></title>
        <meta name="description" content="" />
        <meta name="viewport" content="width=device-width, initial-scale=1" />
        <link rel="stylesheet" href="" />
    </head>
    <style>
        .item{
            color:red;
            background-color: antiquewhite;
            border:1px solid burlywood;
            width:100px;
            height:300px;
        }
    </style>
    <body>
       <div></div>
       
    </body>

    <script>
        const obj={
            uname:'pink',
            age:18,
            hobby:['乒乓球','篮球'],
        }
        const o={}
        function deepCopy(newObj,oldObj){
            for(let k in oldObj){
                if(oldObj[k] instanceof Array){
                    newObj[k]=[];
                    deepCopy(newObj[k],oldObj[k]);
                }else{
                    newObj[k]=oldObj[k];
                }
               
            }
        }
        deepCopy(o,obj)
        console.log(o);
    </script>
</html>

带有数组和对象的深拷贝案例

<!DOCTYPE html>
<html class="no-js">
    <head>
        <meta charset="utf-8" />
        <meta http-equiv="X-UA-Compatible" content="IE=edge" />
        <title></title>
        <meta name="description" content="" />
        <meta name="viewport" content="width=device-width, initial-scale=1" />
        <link rel="stylesheet" href="" />
    </head>
    <style>
        .item{
            color:red;
            background-color: antiquewhite;
            border:1px solid burlywood;
            width:100px;
            height:300px;
        }
    </style>
    <body>
       <div></div>
       
    </body>

    <script>
        const obj={
            uname:'pink',
            age:18,
            hobby:['乒乓球','篮球'],
            family:{
                name:'小秋',
                age:19,
            }
        }
        const o={}
        function deepCopy(newObj,oldObj){
            for(let k in oldObj){
                if(oldObj[k] instanceof Array){
                    newObj[k]=[];
                    deepCopy(newObj[k],oldObj[k]);
                }else if(oldObj[k] instanceof Object){
                   newObj[k]={};
                   deepCopy(newObj[k]=oldObj[k])
                    
                }else{
                    newObj[k]=oldObj[k];
                }
               
            }
        }
        deepCopy(o,obj)
        console.log(o);
    </script>
</html>

利用转化字符串来实现但是方法好像无法复制啊

<!DOCTYPE html>
<html class="no-js">
    <head>
        <meta charset="utf-8" />
        <meta http-equiv="X-UA-Compatible" content="IE=edge" />
        <title></title>
        <meta name="description" content="" />
        <meta name="viewport" content="width=device-width, initial-scale=1" />
        <link rel="stylesheet" href="" />
    </head>
    <style>
        .item{
            color:red;
            background-color: antiquewhite;
            border:1px solid burlywood;
            width:100px;
            height:300px;
        }
    </style>
    <body>
       <div></div>
       
    </body>

    <script>
        const obj={
            uname:'pink',
            age:18,
            hobby:['乒乓球','篮球'],
            family:{
                name:'小秋',
                age:19,
            },
            eat:function(){
                alert('ddd');
            }
        }
      const aa= JSON.stringify(obj);
      console.log(aa);
      const newObj=JSON.parse(aa);
      console.log(newObj);
    </script>
</html>