<input name="shouji" type="text" value="输入手机号简易注册" onclick="clearDefaultText(this,'输入手机号简易注册')"/>
function clearDefaultText (el,message)
{
var obj = el;
if(typeof(el) == "string")
obj = document.getElementById(id);
if(obj.value == message)
{
obj.value = "";
}
obj.onblur = function()
{
if(obj.value == "")
{
obj.value = message;
}
}
}
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<textarea name="morencontect" rows="8" id="contect" onfocus="ClearDefault(this)" onblur="AddDefault(this)">我想旅游</textarea>
var defaultvalue="我想旅游";
function ClearDefault(element)
{
if(element.value==defaultvalue)
{
element.value = "";
}
}
function AddDefault(element)
{
if(element.value=="")
{ element.value =defaultvalue; }
}