更有效地编写这个javascript的方法

我正在为我的网站创建一个联系表单,并在提交之前使用 javascript进行第一层验证,然后通过PHP再次检查,但我是相对较新的javascript,这是我的脚本…

$("#send").click(function() {
    var fullname = $("input#fullname").val();
    var email = $("input#email").val();
    var subject = $("input#subject").val();
    var message = $("textarea#message").val();
    if (fullname == ""){
        $("input#fullname").css("background","#d02624");
        $("input#fullname").css("color","#121212");
    }else{
        $("input#fullname").css("background","#121212");
        $("input#fullname").css("color","#5c5c5c");
    }
    if (email == ""){
        $("input#email").css("background","#d02624");
        $("input#email").css("color","#121212");
    }else{
        $("input#email").css("background","#121212");
        $("input#email").css("color","#5c5c5c");
    }
    if (subject == ""){
        $("input#subject").css("background","#d02624");
        $("input#subject").css("color","#121212");
    }else{
        $("input#subject").css("background","#121212");
        $("input#subject").css("color","#5c5c5c");
    }
    if (message == ""){
        $("textarea#message").css("background","#d02624");
        $("textarea#message").css("color","#121212");
    }else{
        $("textarea#message").css("background","#121212");
        $("textarea#message").css("color","#5c5c5c");
    }
    if (name && email && subject && message != ""){
        alert("YAY");
    }
});

如果所有字段都填写完整,我怎样才能更有效地写这个并发出警报显示,谢谢.

解决方法

$("#send").click(function() {
    var Failed = false;
 
    $('input#fullname,input#email,input#subject,textarea#message').each(function() {
        var item = $(this);
        if (item.val()) {
            item.css("background","#121212").css("color","#5c5c5c");
        } else {
            item.css("background","#d02624").css("color","#121212");
            Failed = true;
        }
    });
 
    if (Failed){
        alert("YAY");
    }
});

更有效地编写这个javascript的方法

解决方法

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