Question

请问 js 如何取到json键值对的key

Answer 1

看看是不是你想要的效果
<script type="text/javascript">
window.onload = function(){
var jo = {"id":123, "name":"wuxiaolan", "age":22};
for(var item in jo){
alert(item);
}
}
</script>

Answer 2

var mydata = {"id":"myId", "name":"myName", "age":20};
for(var item in jo){
alert(item);
}