<HTML><HEAD><title>点击input文本框，文字消失</title><script type="text/javascript">//得到焦点触发事件function OnfocusFun(element,elementvalue){if(element.value==elementvalue){element.value="";element.style.color="#000";}}//离开输入框触发事件function OnBlurFun(element,elementvalue){if(element.value==""||element.value.replace(/\s/g,"")==""){element.value=elementvalue;element.style.color="#999";}}</script></HEAD><body><div>点击<strong>输入框</strong>框内文字消失实例</div><div><span>账号：</span><input type="text" value="请输入用户名" id="UserId" οnfοcus="OnfocusFun(this,'请输入用户名')" style="color:#999" οnblur="OnBlurFun(this,'请输入用户名')"/></div><div><span>密码:</span><input type="text" value="请输入密码" id="Password" οnfοcus="OnfocusFun(this,'请输入密码')" οnblur="OnBlurFun(this,'请输入密码')" style="color:#999"/></body></HTML
