let arr1 = JSON.parse(JSON.stringify(arr2));//深拷贝
//浅拷贝
let obj1 = {a: 1};// 对象浅拷贝, 复制所有可枚举属性
let obj2 = {b: 2};
Object.assign({}, obj1, obj2);// copy obj1 and obj2 to a new obj;
//扩展运算符
let bar = { a: 1, b: 2 };
let baz = { ...bar }; // { a: 1, b: 2 }
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