我们知道javascript可以用alert输出变量的值，但是有时候返回的是一个对象，json格式的数据，jQuery可以用这个方法循环遍历读出对象的值，假如这个对象名称是obj，循环遍历打印它的值：
$.each(obj,function(key,val){
if($.isPlainObject(val) || $.isArray(val)){
subObj(val);
}else{
alert(key+'='+val);
}
});
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