第1个回答 2020-01-06
设置他的value值为匿名,当鼠标焦点进入是清空,鼠标焦点离开时,如果没有输入任何内容,就给他赋值为匿名:
给你例子,慢慢看
<head>
<meta
http-equiv="Content-Type"
content="text/html;charset=UTF-8">
<title>demo01</title>
<script>
window.onload=function()
{
var
oTxt1=document.getElementById('txtName');
oTxt1.onfocus=function()
{
this.value='';
}
oTxt1.onblur=function()
{
if(this.value=='')
{
this.value='匿名';
}
}
}
</script>
</head>
<body>
<form
action="#"
method="post">
<input
type="text"
name="txtName"
id="txtName"
value="匿名"/>
<input
type="submit"
value="提交"/>
</form>
</body>
</html>