<!DOCTYPE html><html><head><meta charset="UTF-8"><title>Document</title></head><body><div style="position: fixed;left: 50%;top: 50%;margin-left: -150px;margin-top: -150px; width:300px;height:300px;background:#eee;"> <div style="position: relative; width: 173px; "> <label for="" id="ipt" style="position: absolute;left: 5px;top: 0;color: #999; ">请输入用户名</label> <input type="text" id="uname" name="uname" style="z-index: 1;" onFocus="hide()" onBlur="show()"/> </div></div><script type="text/javascript"> function hide() { var ipt=document.getElementById("ipt"); ipt.style.display="none"; } function show() { var ipt=document.getElementById("ipt"); var name=document.getElementById("uname"); if(name.value.length>0){ ipt.style.display="none"; } else{ ipt.style.display="block"; } }</script></body></html>
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