日常开发小汇总（5）数组克隆、伪数组转换为真数组、随机排序

1. slice 切割数组实现克隆是浅拷贝

let arr = [1,2, {name:1}]
let newarr = arr.slice(0);
console.log(newarr) //[1,2, {name:1}]
newarr[2].name = 666;
console.log(arr[2].name);//666  
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2. JSON实现克隆 深拷贝

let arr = [1,2, {name:1}]
let newarr = JSON.parse( JSON.stringify(arr) )
newarr[2].name = 666;
console.log(arr[2].name) //1
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3.Object.assign() 浅拷贝

let arr = [1,2, {name:1}]
let newarr = Object.assign([],arr)
newarr[2].name = 666;
console.log(arr[2].name) //666
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4. 转换为真数组

let obj = {
	0:"1",
	1:"2",
	length: 2
}
let arr = Array.prototype.slice.call(obj,0)
//也可以写成Array.prototype.slice.call(obj)
console.log(arr)
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5. 数组随机排序

let ar = [1,2,3,4,5,6,7,8,9,10]
ar.sort(()=> (Math.random()-0.5))
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6.浅拷贝

let obj = {
        name: "xx",
        age:12,
        test: {
          sex: "male"
        }
      }
     let copyB = Object.fromEntries(  Object.entries(obj) )
     console.log(obj === copyB) //false
     console.log(obj.test === copyB.test//true
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