<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<title>去重</title>
</head>
<body>
<script>
//循环比较
function compMethod(arr){
var len = arr.length,temp;
for(var i = 0;i<len;i++){
temp = arr[i];
for(var j =i+1;j<len;j++){
if(arr[j]==temp){
arr.splice(j,1)
}
}
}
return arr
}
//对象属性
function objectMethod(arr){
var obj = {},array = [],len = arr.length;
for(var i = 0;i<len;i++){
if(!obj[arr[i]]){
obj[arr[i]] = 1;
array.push(arr[i])
}
}
return array;
}
//indexOf
function indMethod(arr){
var index,len = arr.length,array = [];
for(var i = 0;i<len;i++){
if(arr.indexOf(arr[i]) == i ) {
array.push(arr[i])
}
}
return array;
}
var arr = [1,1,3,3,4,4,6,'a','a'];
console.log(compMethod(arr));
console.log(objectMethod(arr));
console.log(indMethod(arr))
</script>
</body>
</html>