new Set()方法
var arr = [1,2,1,2,3,4,5,6,6,9,9,8];
console.log(new Set(arr))
Array.from(new Set(arr))方法
var arr = [1,2,1,2,3,4,5,6,6,9,9,8];
console.log(Array.from(new Set(arr))
BFC:块级元素格式化上下文
浅拷贝
var a = {
name = 1
}
b=a;
b.name = 2
console.log(a) //2
深拷贝
var newObj = {};
function deepCopy(obj,newObj){
for(var i in obj){
if(typeof(obj[i]) === "object"){//判断这个是否为对象或者是数组
newObj[i] = Array.isArray(obj[i])?[]:{};//newObj.arr={}
deepCopy(obj[i],newObj[i]);//用递归把数组或者数组中的每一个元素遍历出来
}else{
newObj[i] = obj[i];//newObj.name=bgg
}
}
return newObj;
}
var res = deepCopy(obj1,newObj);
console.log(res);
//改变obiect
res.skill = function(){
console.log("9999");
}
obj1.skill();
res.skill();
res.arr[0] = "888";
console.log(obj1.arr);
console.log(res.arr);
