陣列去空，去重
阿新 • • 發佈：2019-01-22
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>qc</title>
<script src="jquery.1.9.1.min.js"></script>
</head>
<body>
<script>
//陣列去空值
var arr1=["某某","",3,5,"color","",3,"某某","color",""]
console.log(arr1)
//拓展陣列去空值的方法
Array.prototype.removeEmpty=function () {
for(var i=0;i<this.length;i++){
if(this[i]==""||typeof(this[i])=="undefind"){
this.splice(i,1);
i--;
}
}
return this;
}
var arr2=arr1.removeEmpty();
console.log(arr2)
</script>
<script>
//陣列去重
var arr3=["比特幣","比特幣","萊特幣","萊特幣","66","66",88,88,"",""]
var arr4=["比特幣","比特幣","萊特幣","萊特幣","66","66",88,88,"",""]
//方法一：拓展陣列去重的方法
Array.prototype.removeRepeat=function () {
var res=[];
var json={};
for(var i=0;i<this.length;i++){
if(!json[this[i]]){
res.push(this[i]);
json[this[i]]=1;
}
}
return res;
}
console.log(arr3.removeRepeat())
//方法二：用es6中set結合Array.from()方法去重
var arr5=new Set(arr4);//這裡使用的是Set的一個特性，集合中不會包含重複項。
console.log(arr5)
var arr6=Array.from(arr5)//Array.from()是將一個類陣列物件或者可遍歷物件轉換成一個真正的陣列
console.log(arr6)
</script>
</body>
</html>