数组深拷贝

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        <title>数组深拷贝</title>
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        <script type="text/javascript"> let a1 = [{ age: 1 }]; // 方法一 loadsh
            // 方法二 json
 let a2 = JSON.parse(JSON.stringify(a1)) a2[0].age = 2 console.log(a1, a2) // 方法3
 let a3 = a1.concat() a3[0] = { age: 2 } console.log(a1, a3) // 方法4
 let a4 = a1.slice() a4[0] = { age: 3 } console.log(a1, a4) // 方法5
 let a5 = a1.splice() a5[0] = { age: 3 } console.log(a1, a5) // 方法6
            function copy(arr) { let obj = arr instanceof Array ? [] : {}; for (let i in arr) { if (typeof arr[i] == 'object' && arr[i] !== undefined) { obj[i] = copy(arr[i]) } else if (typeof arr[i] == 'object' && arr[i] == undefined) { obj[i] = null } else { obj[i] = arr[i] } } return obj } // 方法7
 let a6 = a1.filter(i => i) a6[0] = { age: 3 } console.log(a1, a6)
　　　　　　　　// 方法8
 // Array.from
 // 方法9
　　　　　　　　// Array.of
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