每次更改都发送请求很糟糕，延迟上一次更改的ajax

sending a request on each change is just bad, delay the ajax on the last change

var changeTimer = false;

$("your inputs").on("your change event",function(){
        if(changeTimer !== false) clearTimeout(changeTimer);
        changeTimer = setTimeout(function(){
            /* your ajax here */
            changeTimer = false;
        },300);
});