Prototype extension implementation code of local object Array_javascript skills

Copy code The code is as follows:

Array.prototype.del=function(){
var b ={},c,i=0,l=this.length,j;
for(;ic=this.shift();
c in b ? b [c] : b[c]=0;
}
for(j in b){
if(b[j]>0)this.push( j||j);
}
return this;
}
var a=[1,2,2,3,3,3,'a','b','b'];
alert(a .del());

Guoguo’s deduplication method

Copy code The code is as follows:

Array.prototype.del=function(){
return (function (i, n, j, u, o){
for (; i < j; i ) {
o = this[i];
o in u ? 0 : (u[this[n ] = o] = 1)
}
this.length = n;
return this
}).call(this, 0, 0, this.length, {})
}
var a=[1,2,2,3,3,3,'a',' b','b'];
alert(a.del())