数组去重的几种方法

数组去重

es6的new Set(arry)

var arry =[1,25,15,1,2,15,5,15,25,35,1];
var set =new Set(arry);
console.log([...set]);

数组内置filter方法(兼容ie9+)

var arry =[1,25,15,1,2,15,5,15,25,35,1];
var newArry = arry.filter(function(currenValue,index,arr){
    return index == arr.indexOf(currenValue);
})
console.log(newArry);

赋值给空数组加indexOf检测

var arry =[1,25,15,1,2,15,5,15,25,35,1];
var arr2 = [];
for(var i= 0; i<arry.length;i++){
    if(arr2.indexOf(arry[i]) == -1) {
        arr2.push(arry[i]);
    }
}
console.log(arr2);

通过检测属性的方法

Array.prototype.unique3 = 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;
}

var arr = [112,112,34,'你好',112,112,34,'你好','str','str1'];
alert(arr.unique3());