for in循环
代码:
var obj = { "10001":"xxx1","10002":"xxx2","10003":"xxx3","10004":"xxx4","10005":"xxx5" };
for (var i in obj){ console.log(i)};
输出结果:10001 10002 10003 10004 10005
获取相应对象属性:
console.log( obj[i] );
下面是for in循环数组
var arr = [1,2,3,4,5];
for(var i in arr ){ console.log(i)};
输出结果:0 1 2 3 4
结合文档说明:for...in 语句用于遍历数组或者对象的属性(对数组或者对象的属性进行循环操作)。