ajax请求成功前loading

1.jquery方式

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>ajax加载loading图标</title>
</head>
<body>
<form id="test-form" action="test.php" method="post">
<input type="text" name="username">
</form>
<button id="btn">提交</button>
<div id="loading"></div>
<div id="res"></div>
</body>
<script>
$('#btn').click(function(){
$.ajax({
url:$('#test-form').attr('action'), //发送后台的url
type:'post',
data:$('#test-form').serialize(), //序列化表单内容
dataType:'text', //后台返回的数据类型
timeout:15000, //超时时间
beforeSend:function(XMLHttpRequest){
$("#loading").html("<img src='./images/loading.gif' />"); //在后台返回success之前显示loading图标
},
success:function(data){ //data为后台返回的数据
$("#loading").empty(); //ajax返回成功，清除loading图标
$('#res').html('ajax请求成功！');
}
});
});
</script>
</html>

2.js方式

xmlhttp.onreadystatechange = function(){
var loadingdiv = document.getelementbyid("loading");
loadingdiv.innerhtml = "loading...";
loadingdiv.style.right = "0";
loadingdiv.style.top = "0";
loadingdiv.style.display = "block";
//load completed
if(xmlhttp.readystate == 4) {
loadingdiv.style.display = "none";
loadingdiv.innerhtml = "";
if(xmlhttp.status == 200) {
var str = xmlhttp.responsetext;
/* do something here ! */
}
else
alert("error!" + "nstatus code is: " + xmlhttp.status + "nstatus text is: " + xmlhttp.statustext);
}
}

巴特西

ajax请求成功前loading

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