js 數組 删除數組中指定下标傳回新數組

Array.prototype.remove = function(dx) {

if(isNaN(dx) || dx > this.length) {

return false;

}

for(var i = 0, n = 0; i < this.length; i++) {

if(this[i] != this[dx]) {

this[n++] = this[i]

}

}

this.length -= 1

}

var a = [1, 2, 3, 4, 5];    //目标數組

a.remove(4);           //删除目标數組的下标

console.log(a)