封装数组去重的方法（三种）
2017-06-27 本文已影响284人
亚当斯密
额.......................
第一种：
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
</head>
<body>
<script type="text/javascript">
Array.prototype.count = function(){
for(var i = 0; i < this.length-1; i++){
for(var j = i+1; j < this.length; j++){
if(this[i] == this[j]){
this.splice(j,1);
i--;
}
// 去重后排序
// if(this[i] > this[j]){
// [this[i],this[j]] = [this[j],this[i]];
}
}
}
console.log(this)
}
var newArr = [1,2,9,66,99,3,3,3,3,3,3,3,3,33,4,4,5,6,-111,0,9,-3,-2,0];
newArr.count();
</script>
</body>
</html>
第二种：
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>数组去重</title>
</head>
<body>
<script type="text/javascript">
Array.prototype.count = function(){
for (var i = 0; i < this.length-1; i++) {
for(var j = i+1; j < this.length; j++){
if(this[j] > this[i]){
var temp = this[j];
this[j] = this[j+1];
this[j+1] = temp;
}
}
};
}
var newArr = [1,3,2,4,5,6,3,33,44,22,3];
</script>
</body>
</html>
第三种：
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
</head>
<body>
<script type="text/javascript">
function count(arr){
var newArr = [];
for(var i = 0;i < arr.length; i++){
if(newArr.indexOf(arr[i])==-1){
newArr.push(arr[i]);
}
}
//本地排序（去重后）
newArr.sort(function(a,b){
return a-b;
});
return newArr;
}
var newAr1 = [1,2,2,2,2,3,3,3,4,4,5,5,65,6,6,6];
console.log(count(newAr1))
</script>
</body>
</html>
结束！
