js 验证电子邮箱

js:
<script type="text/JavaScript">
function checkemail()
{
var temp = document.getElementById("email");
var myreg = /(\S)+[@]{1}(\S)+[.]{1}(\w)+/;
if(temp.value!="")
{
if(!myreg.test(temp.value))
{
document.getElementById("mail").innerHTML="请输入有效的emailemail!";
document.getElementById("mail").style.color="red";
temp.value="";
temp.focus();
return false;
}
else{
document.getElementById("mail").innerHTML="emailemail可以使用";
document.getElementById("mail").style.color="green";
}
}
}
</script>

html body部分
邮箱地址：<input id="email" name="email" onBlur="checkemail()" type="text" /><span id="mail"></span> <br>