<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>test</title>
<script>
function test(){
var t = document.getElementById("test")
t.setAttribute("title","this is message")
}
</script>
</head>
<body>
<div>
<input type="button" name="" value="拨打" id="test" onmouseover="test();"/>
</div>
</body>
</html>
<!DOCTYPE html>
<html>
<head>
<meta char
阅读背景：
鼠标悬停事件-----提示信息
来源：互联网
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