(function (params,callback,callbackArgs){
$.ajax({
url: _url,
data: params,
type: "GET",
timeout: 15000,
async: false,
dataType: "jsonp",
success: function (response) {
if(typeof callbackArgs=='undefined'){//一直是'true'
var callbackArgs={};
}
callbackArgs.res=response;
callback.call(this,callbackArgs);//但是callback这个参数有值
},
error: function (data) {
alert("无对应数据！");
}
});
})({a:1},function(){alert()},{a:'1'});//此处传入3个参数