验证链接地址是否为http或者https开头的

<div class="col-md-3 J-radio-relative"  data-r="linkType" data-v="URL">     <input type="text" name="linkContent2" id="add_banner_linkUrl"  style="width:98%" onclick="checkUrl();"   maxlength="200"  placeholder="请输入链接地址"/></div>//    链接地址判断    function checkUrl() {        var Expression=/http(s)?:\/\/([\w-]+\.)+[\w-]+(\/[\w- .\/?%&=]*)?/;        var objExp=new RegExp(Expression);        return objExp.test($("#add_banner_linkUrl").val());        if(objExp.test($("#add_banner_linkUrl").val())==true){        }else{            alert("您输入的链接地址有误")        }    }