电话号码验证

<input class="dx-down" type="text" value="" placeholder="请输入电话号码">

<a href="#"><img src="images/yuyue.png" alt=""  class="yuyue"/></a>

<script>
$(function () {
$(".yuyue").click(function () {
var phval = $(".dx-down").val();


if (phval == "请输入手机号") {
alert("请输入手机号");
return false;
} else if (!/^1[35789]\d{9}$/.test(phval)) {
alert("请输入正确的手机号");
return false;
}
});




});
</script>

.dx-down {

1. width: 7.91666667rem;
2. height: 1.94444444rem;
3. background: none;
4. border: none;
5. position: absolute;
6. color: #b9b9b9;
7. left: 0.13888889rem;
8. top: 0.13888889rem;
9. font-size: 0.55555556rem;
10. text-align: center;

}