<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<script type="text/javascript">
function set(){
var divv = document.getElementById("mydiv");
divv.innerHTML = "<font color='red' size='4'>用户名不空!</font>";
//divv.innerText = "<font color='red' size='4'>用户名不空!</font>";
}
</script>
<div id="mydiv"></div>
<input type="button" value="123" onclick="set()">
</body>
</html>
innerHTML
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