第一种
Array.prototype.remove1=function(){
for(var i=0;i<this.length;i++){
for(var j=i+1;j<this.length;j++){
if(this[i]==this[j]){
this.splice(j,1);
j--;
}
}
}
return this;
}
var arr = [1,2,3,4,4,5,6,6,12,3,4,5,4,212,5,6];
var newArr = arr.remove1();
var arr2 = [100,18,2,3,8,4,0,9,20];
var newArr2 = arr2.remove1();
//大到小
newArr.sort(function(a,b){return b-a;})
//小到大
newArr2.sort(function(a,b){return a-b;})
console.log(newArr);
console.log(newArr2);
第二种
Array.prototype.remove2 = function(){
var newArr = [];
for(var i=0;i<this.length;i++){
if(newArr.indexOf(this[i])==-1){
newArr.push(this[i]);
}
}
return newArr;
}
var arr = [1,2,3,4,4,5,6,6,12,3,4,5,4,212,5,6];
var newArr3 = arr.remove2();
console.info(newArr3);
Array.prototype.remove3 = function(){
var newArr = [];
var obj={};
for(var i=0;i<this.length;i++){
if(!obj[this[i]]){
obj[this[i]]=true;
newArr.push(this[i]);
}
}
return newArr;
}
var arr = [1,2,3,4,4,5,6,6,12,3,4,5,4,212,5,6];
var newArr4 = arr.remove3();
console.info(newArr4);
第四种
Array.prototype.remove4 = function(){
var newArr = [];
for(var i=0;i<this.length;i++){
for(var j=i+1;j<this.length;j++){
if(this[i]==this[j]){
j=++i;
}
}
newArr.push(this[i]);
}
return newArr;
}
var arr = [1,2,3,4,4,5,6,6,12,3,4,5,4,212,5,6];
var newArr5 = arr.remove4();
console.info(newArr5)