我们都知道js中的alert有弹窗提示的作用，但它在实践项目中很少使用，原因就是因为长的太难看！那么今天我就给大家讲一下如何来美化这个系统自带的alert！详细代码如下：
<!DOCTYPE html>
<html lang="zh-cn">
<head>
<meta charset="UTF-8">
<title>教你如何更改网页的默认alert弹窗</title>
</head>
<body>
<!-- 更改系统默认弹窗 -->
<script type="text/javascript">
window.alert = function(str)
{
var shield = document.createElement("DIV");
shield.id = "shield";
shield.style.position = "absolute";
shield.style.left = "50%";
shield.style.top = "50%";
shield.style.width = "280px";
shield.style.height = "150px";
shield.style.marginLeft = "-140px";
shield.style.marginTop = "-110px";
shield.style.zIndex = "25";
var alertFram = document.createElement("DIV");
alertFram.id="alertFram";
alertFram.style.position = "absolute";
alertFram.style.width = "280px";
alertFram.style.height = "150px";
alertFram.style.left = "50%";
alertFram.style.top = "50%";
alertFram.style.marginLeft = "-140px";
alertFram.style.marginTop = "-110px";
alertFram.style.textAlign = "center";
alertFram.style.lineHeight = "150px";
alertFram.style.zIndex = "300";
strHtml = "<ul style=/"list-style:none;margin:0px;padding:0px;width:100%/">/n";
strHtml += " <li style=/"background:#626262;text-align:left;padding-left:20px;font-size:14px;font-weight:bold;height:25px;line-height:25px;border:1px solid #F9CADE;color:white/">[自定义alert]</li>/n";
strHtml += " <li style=/"background:#787878;text-align:center;font-size:12px;height:95px;line-height:95px;border-left:1px solid #F9CADE;border-right:1px solid #F9CADE;color:#DCC722/">"+str+"</li>/n";
strHtml += " <li style=/"background:#626262;text-align:center;font-weight:bold;height:30px;line-height:25px; border:1px solid #F9CADE;/"><input type=/"button/" value=/"确 定/" onclick=/"doOk()/" style=/"width:80px;height:20px;background:#626262;color:white;border:1px solid white;font-size:14px;line-height:20px;outline:none;margin-top: 4px/"/></li>/n";
strHtml += "</ul>/n";
alertFram.innerHTML = strHtml;
document.body.appendChild(alertFram);
document.body.appendChild(shield);
this.doOk = function(){
alertFram.style.display = "none";
shield.style.display = "none";
}
alertFram.focus();
document.body.onselectstart = function(){return false;};
}
</script>
<script>
// 测试 alert
alert('http://www.xttblog.com/');
</script>
</body>
</html>
运行效果如下：
原文地址：http://www.xttblog.com/?p=361
： » 教你如何更改网页的默认alert弹窗
原创文章，作者：306829225，如若转载，请注明出处：https://blog.ytso.com/tech/aiops/251130.html