按索引访问JavaScript对象元素

Question

在下面的代码中，我想在for循环中动态访问key，value。我该怎么办？

 s= {5: "456", 6: "123"} 
 var count = Object.keys(s).length
 for (var j_cnt=0;j_cnt<count;j_cnt++)
 {

 }

注意：I do not want a normal for loop since i need to something with the count

Answer 1

如果您真的需要计数，请定义一个外部count变量并在for in循环中递增：

var s     = {5: "456", 6: "123"},
    count = 0;

for (var key in s) {
    if (s.hasOwnProperty(key))
        console.log(s[key]);
    count++;
}

Answer 2

这不是“最佳做法”，而是因为您专门寻找for循环......

s= {5: "456", 6: "123"} 
var count = Object.keys(s).length;
for (var j_cnt=0; j_cnt<count; j_cnt++) {
   var theKey = Object.keys(s)[j_cnt];
   var theValue = s[theKey];
}