文本框点击时文字消失，失去焦点时文字出现

</p> <p> <title><a href="https://kunjuke.com/tag/288/" title="文本框" target="_blank">文本框</a><a href="https://kunjuke.com/tag/674/" title="点击" target="_blank">点击</a>时<a href="https://kunjuke.com/tag/266/" title="文字" target="_blank">文字</a><a href="https://kunjuke.com/tag/6256/" title="消失" target="_blank">消失</a>，失去<a href="https://kunjuke.com/tag/4114/" title="焦点" target="_blank">焦点</a>时文字出现 </title> </p> <p> function addlistener(element,e,fn){<br /> if(element.addeventlistener){<br /> element.addeventlistener(e,fn,false);<br /> } else {<br /> element.attachevent("on" + e,fn);<br /> }<br /> }<br /> var myinput = document.getelementbyid("myinput");<br /> addlistener(myinput,"click",function(){<br /> myinput.value = "";<br /> })<br /> addlistener(myinput,"blur",function(){<br /> myinput.value = "请输入您的姓名";<br /> }) </p> <p>
[ctrl+a 全选 注:如需引入外部js需刷新才能执行]