一段手机号验证js代码

<div class="reg_con" style="position:relative;">
	<label>联系电话</label>
	<input id="telphone" type="text" name="userExt.telphone" value="13800000000" class="inp" maxlength="11" />
	<div id="telphone_tip" style="position:absolute;width: 250px; height: 20px; right:90px;top:20px; color:#c00; font-weight:bold; border:1px solid red;">
	</div>
</div>

$(function(){
	$("#telphone").blur("blur",function(){
		var telphone = $("#telphone").val();
		var myreg = /^1[34578]\d{9}$/;
		if(telphone == ""){
		$("#telphone_tip").html("联系电话不能为空");
		}
		else
		{
		if(myreg.test(telphone)){
		$("#telphone_tip").html("");
		}
		else
		{
		$("#telphone_tip").html("联系电话格式不正确");
		};
		};
	});
})