摘要：
以下三个步骤用于实现源网络
以下3步走实现加载中，来源网络……
1.添加CSS 加载中转圈CSS
#loading {
margin: auto;
margin-top: 10px;
display: block;
100px;
height: 100px;
background: #FFFFFF;
/*border: 1px solid black;*/
}
#loading .pic {
display: block;
50px;
height: 50px;
border-radius: 50%;
box-shadow: 0 2px 0 #666;
animation: loop 1s infinite;
-webkit-animation: loop 1s infinite;
}
@keyframes loop {
0% {
transform: rotate(0deg);
}
100% {
transform: rotate(360deg );
}
}2.添加JS代码 点击后出现加载中效果
window.onload=funciton(){
//目标控件btnQuery Click后呈现加载中
document.getElementById('btnQuery').onclick = function () {
document.getElementById("loading").style.display = 'block';
}
}加载完成后隐藏加载中
document.onreadystatechange = function () {
if (document.readyState == "complete") {//检测加载完成
document.getElementById("loading").style.display = 'none';
}
}3.添加P标签
<p id="loading">
<span class="pic"></span>
</p>鉴于上述实现方式比较麻烦，小子考虑将其全部集成到JS中实现。其实现如下：
window.onload = function () { var loadCss = document.createElement("style"); loadCss.type = "text/css"; loadCss.innerHTML = "@keyframes loop { 0%{transform: rotate(0deg);} 100%{ transform: rotate(360deg);}"; document.head.appendChild(loadCss); var p = document.createElement("p"); p.id = "loading"; var pic = document.createElement("picture"); p.style.cssText = "display: none; 100px;height: 100px;background: rgba(255, 255, 255,0);position: fixed;top: 50%;left: 50%;z-index: 999999;"; pic.style.cssText = "display: block; 50px;height: 50px;border-radius: 50%;box-shadow: 0 2px 0 #666; animation: loop 1s infinite;-webkit-animation: loop 1s infinite;"; p.appendChild(pic); document.body.appendChild(p); document.getElementById('btnQuery').onclick = function () {//目标控件，换成需要的ID document.getElementById("loading").style.display = 'block'; } } document.onreadystatechange = function () { if (document.readyState == "complete") {//检测加载完成 try { document.getElementById("loading").style.display = 'none'; //document.body.removeChild(p); } catch (e) { } } }
注意：若你的JS中已经使用过了window.onload,那么请将上述写在window.onload中的代码加入你的onload中，或者将其全部copy出来放到页面最后的script标签中，否则可能会对你自己所写的window.onload中函数造成影响（测试中出现此问题）。
写在页面底部则如下：
<script>
var loadCss = document.createElement("style");
loadCss.type = "text/css";
loadCss.innerHTML = "@keyframes loop { 0%{transform: rotate(0deg);} 100%{ transform: rotate(360deg);}";
document.head.appendChild(loadCss);
var p = document.createElement("p");
p.id = "loading";
var pic = document.createElement("picture");
p.style.cssText = "display: none; 100px;height: 100px;background: rgba(255, 255, 255,0);position: fixed;top: 50%;left: 50%;z-index: 999999;";
pic.style.cssText = "display: block; 50px;height: 50px;border-radius: 50%;box-shadow: 0 2px 0 #666; animation: loop 1s infinite;-webkit-animation: loop 1s infinite;";
p.appendChild(pic);
document.body.appendChild(p);
document.getElementById('btnQuery').onclick = function () {//目标控件，换成需要的ID
document.getElementById("loading").style.display = 'block';
}
document.onreadystatechange = function () {
if (document.readyState == "complete") {//检测加载完成
try {
document.getElementById("loading").style.display = 'none';
//document.body.removeChild(p);
} catch (e) {
}
}
}
</script>