//分开添加,关键字shallow copy,如果遇到数组,复制数组中的元素
Array.prototype.concat = function(){
var i=0;
while(i<arguments.length){
if(typeof arguments[i] === 'object'&&typeof arguments[i].splice ==='function' &&!arguments[i].propertyIsEnumerable('length')){
// NOT SHALLOW COPY BELOW
// Array.prototype.concat.apply(this,arguments[i++]);
var j=0;
while(j<arguments[i].length) this.splice(this.length,0,arguments[i][j++]);
i++;
} else{
this[this.length]=arguments[i++];
}
}
return this;
}
Array.prototype.join = function(separator){
var i=0,str="";
while(i<this.length) str+=this[i++]+separator;
return str;
}
Array.prototype.pop = function() { return this.splice(this.length-1,1)[0];}
Array.prototype.push = function(){
Array.prototype.splice.apply(this,
[this.length,0].concat(Array.prototype.slice.apply(arguments))); //这里没有直接处理参数,而是复制了一下
return this.length;
}
Array.prototype.reverse = function(){
for(var i=0;i<this.length/2;i++){
var temp = this[i];
this[i]= this[this.length-1-i];
this[this.length-1-i] = temp;
}
return this;
}
Array.prototype.slice = function(start, end){
var len =this.length;
start=start<0?start+=len:start?start:0;
end =end<0?end+=len:end>len?len:end?end:len;
var i=start;
var res = [];
while(i<end){
res.push(this[i++]);
}
return res;
}
//arr.unshift(ele1,ele2,ele3....)
Array.prototype.unshift =function(){
Array.prototype.splice.apply(this,[0,0].concat(Array.prototype.slice.apply(this,arguments)));
}
更多:原生js怎么删除classjs Array对象的扩展函数代码
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