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On the query page, the copy button can only copy the content of the div above. How to copy the content below? ? ? please. . . . . .
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Shallow copy: Use `Object.assign()` or the spread operator `...` to copy an object, use `Array.from()` or the spread operator `...` to copy an array. For example:
let obj1 = { name: 'Alice', age: 20 }; let obj2 = Object.assign({}, obj1); // 浅拷贝对象 console.log(obj2); // 输出{ name: 'Alice', age: 20 } let arr1 = [1, 2, 3]; let arr2 = [...arr1]; // 浅拷贝数组 console.log(arr2); // 输出[1, 2, 3]
-Deep copy: Use `JSON.parse()` and `JSON.stringify()` to implement deep copy. For example:
let obj1 = { name: 'Alice', age: 20 }; let obj2 = JSON.parse(JSON.stringify(obj1)); // 深拷贝对象 console.log(obj2); // 输出{ name: 'Alice', age: 20 } let arr1 = [1, 2, [3, 4]]; let arr2 = JSON.parse(JSON.stringify(arr1)); // 深拷贝数组 console.log(arr2); // 输出[1, 2, [3, 4]]
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![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
Shallow copy: Use `Object.assign()` or the spread operator `...` to copy an object, use `Array.from()` or the spread operator `...` to copy an array. For example:
let obj1 = { name: 'Alice', age: 20 }; let obj2 = Object.assign({}, obj1); // 浅拷贝对象 console.log(obj2); // 输出{ name: 'Alice', age: 20 } let arr1 = [1, 2, 3]; let arr2 = [...arr1]; // 浅拷贝数组 console.log(arr2); // 输出[1, 2, 3]-Deep copy: Use `JSON.parse()` and `JSON.stringify()` to implement deep copy. For example:
let obj1 = { name: 'Alice', age: 20 }; let obj2 = JSON.parse(JSON.stringify(obj1)); // 深拷贝对象 console.log(obj2); // 输出{ name: 'Alice', age: 20 } let arr1 = [1, 2, [3, 4]]; let arr2 = JSON.parse(JSON.stringify(arr1)); // 深拷贝数组 console.log(arr2); // 输出[1, 2, [3, 4]]