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在一次测试中，请求后台数据报net::ERR_CONNECTION_REFUSED
的错误。我的这次具体失败的原因是因为请求地址错误的原因。能导致这个问题的原因有很多种，1，有可能是网络原因2，有可能是请求地址错误
….产生这个错误最归根揭底的原因就是ajax请求失败；
当时做的登陆功能的测试，在页面上反应是点击登陆后，没有任何反应，用户体验非常的不好
面对这种情况，如果在ajax请求时再做出一层的判断，在ajax请求不成功的情况下，给出失败提示，体验会更好一些
具体优化代码如下：
第一种：在全局去监听失败的ajax请求，缺点是并无事件的针对性，可能会带来不好的效果
$(document).ajaxError(function(){
alert("请求出错!");
});
第二种：对单个的ajax请求做出对应的成功或失败的判断
$.ajax({
url:"system/login/login.action",
timeout:6000,
success:function(data){}
}).done().fail(function(){
alert('网络不行，请求错误')
})
