input onfocus,onblur

<input type="text" style="color: rgb(153, 153, 153);" value="用户名" class="clear-input" onfocus="cls(this,'用户名');" onblur="res(this,'用户名');" name="userId" id="userId" tabindex="1">

　　

<div class="p-r">
	<span class="p-tips" id="onPass" style="display: block;">密码</span>
	<input onblur="showPass()" onfocus="hidePass();" oncut="return false" onpaste="return false" oncopy="return false" //input禁止复制，粘贴，剪切
tabindex="1" id="password" name="password" class="clear-input2" type="password">
</div>

　　

function hidePass(){
	$('#onPass').hide();
}
function showPass(){
	if($('#password').val()==''){
	$('#onPass').show();
	}
}

　　

function cls(obj,name) {
    if (obj.value == name) {
    obj.value = "";
    obj.style.color="#303238";
    }
}
function res(obj,name) {
    if (obj.value == "") {
    obj.value = name;
    obj.style.color="#999";
    }
}