html 部分

<form enctype="multipart/form-data" method="post" onsubmit="return check(this)">
 
    <div class="d01">
        <input type='text' name='company' id='company' class='e01' placeholder="公司名称" value='' />
        <input type='text' name='name' id='name' placeholder="姓名" class='e01 e02' value='' />
    </div>
    <div class="d01">
        <input type='text' name='zhiwei' id='zhiwei' placeholder="职位" class='e01' value='' />
        <input type='text' name='tel' id='tel' class='e01 e02' placeholder="联系方式" value='' />
    </div>
    <div class="d02">
        <input type='text' name='yewu' id='yewu' class='e01' placeholder="主营业务" value='' />
    </div>
    <div class="d03">
        <textarea name='xuqiu' id='xuqiu' class="e01" placeholder="合作需求"></textarea>
    </div>
    <div class="d04">
        <input type="submit" name="submit" value="提 交" class='e01' />
    </div>
</form>

js 部分

function check(form) {
    const company = form.company.value;
    const name = form.name.value;
    const zhiwei = form.zhiwei.value;
    const tel = form.tel.value;
    const yewu = form.yewu.value;
    const xuqiu = form.xuqiu.value;
 
    if (!tel) {
        alert('请输入联系方式!');
        form.tel.focus();
        return false;
    }
 
    function phoneFun(phones) {
        let myreg = /^[1][3,4,5,7,8,9][0-9]{9}$/;
        if (!myreg.test(phones)) {
            return false;
        } else {
            return true;
        }
    }
 
    if (!phoneFun(tel)) {
        console.log(tel);
        alert("请正确的手机号码!");
        form.tel.focus();
        return false;
    }
 
    const dataString =
            'company=' + company +
            '&name=' + name +
            '&zhiwei=' + zhiwei +
            '&tel=' + tel +
            '&yewu=' + yewu +
            '&xuqiu=' + xuqiu +
            '&action=post' +
            '&diyid=1&do=2&dede_fields=company,text;name,text;zhiwei,text;tel,text;yewu,text;xuqiu,multitext&dede_fieldshash=0e68297e08576bda73155ce736f0cc45';
 
    $.ajax({
        type: "POST",
        url: "/plus/diy.php", 
        data: dataString, //传值
        success: function(data) {
            alert("手机提交成功，稍后客服人员将与您联系!");
            window.location.href = window.location.href;
        }
    });
 
    return false;
}