手写源码实现数组翻转reverse

//首先这个方法是写在数组的原型上的方法

var arr = [1,2,3,4,5];

Array.prototype.myReverse = 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;

}

arr.myReverse();