<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>重写alert方法</title>
<style type="text/css">
*{margin:0;padding:0;font-size:12px;}
.m-alert{
position: absolute;
left: 0;
right: 0;
top: 0;
bottom: 0;
margin: auto;
200px;
height: 100px;
background: #ccc;
text-align: center;
border: 1px solid #999;
}
.u-con{
height: 60px;
line-height: 60px;
color: #fff;
}
.u-btn{
display: inline-block;
cursor: pointer;
80px;
height: 20px;
line-height: 20px;
background: #999;
margin-top: 10px;
border: 1px solid #FFF;
}
</style>
</head>
<body>
</body>
<script type="text/javascript">
window.alert = function(str){
var alertWrap = document.createElement("div");
var alertBtn = document.createElement("a");
var alertContent = document.createElement("p");
alertContent.innerHTML = str;
alertBtn.innerHTML = "关闭";
alertWrap.className = "m-alert";
alertBtn.className = "u-btn";
alertContent.className = "u-con";
alertWrap.appendChild(alertContent);
alertWrap.appendChild(alertBtn);
document.body.appendChild(alertWrap);
}
alert('弹窗666');
</script>
</html>