JS数组的遍历方式for循环与for...in
JS数组的遍历方法有两种:
第一种:一般的for循环,例如:
vara=newArray("first","second","third") for(vari=0;i<a.length;i++){ document.write(a[i]+","); }
输出的结果:fitst,second,third
第一种:用for...in这种遍历的方式,例如:
vararr=newArray("first","second","third") for(variteminarr){ document.write(arr[item]+","); }
输出的结果:fitst,second,third