$(document).ready(function () {
    // 找到所有菜单, 并添加显示和隐藏菜单事件
    var v_email = $("#email").val();

});

function isEmail(email) {
    if (email.length > 50) {
        return false;
    }
    var re = /^(([0-9a-zA-Z]+)|([0-9a-zA-Z]+[_.0-9a-zA-Z-]*[0-9a-zA-Z]+))@([a-zA-Z0-9-]+[.])+([a-zA-Z]{2}|net|NET|com|COM|gov|GOV|mil|MIL|org|ORG|edu|EDU|int|INT)$/;
    if (email.search(re) != -1) {
        return true;
    }
    return false;