我试图用javascript弹出一个警报，但什么也没发生

我是javascript的初学者，我正在尝试在给定条件下弹出一个警报框。但是，我的代码中没有弹出任何内容。页面刷新，url栏包含我在表单中输入的信息。我的代码怎么了

function validateform(form)
{
 var self = 1;
 var spouse = 1;
 var mom = 1;
 var dad = 1;
 var educ = 1;
 var work = 1; 
 var elig = 1;

if((form.country.value == "Bangladesh" || form.country.value == "Brazil" || form.country.value == "Canada" || form.country.value == "China" || form.country.value == "Colombia" || form.country.value == "Dominican Republic" || form.country.value == "Ecuador" || form.country.value == "El Salvador" || form.country.value == "Haiti" )|| (form.country.value == "India" || form.country.value == "Jamaica" || form.country.value == "Mexico" || form.country.value == "Nigeria" || form.country .value == "Pakistan" || form.country.value == "Peru" || form.country.value == "Philippines" || form.country.value == "South Korea" || form.country.value == "United Kingdom" || form.country.value == "Vietnam"))
{
    self = 0;
}

if((form.countryspouse.value = '' || form.countryspouse.value == "Bangladesh" || form.countryspouse.value == "Brazil" || form.countryspouse.value == "Canada" || form.countryspouse.value == "China" || form.countryspouse.value == "Colombia" || form.countryspouse.value == "Dominican Republic" || form.countryspouse.value == "Ecuador" || form.countryspouse.value == "El Salvador" || form.countryspouse.value == "Haiti" )|| (form.countryspouse.value == "India" || form.countryspouse.value == "Jamaica" || form.countryspouse.value == "Mexico" || form.countryspouse.value == "Nigeria" || form.countryspouse.value == "Pakistan" || form.countryspouse.value == "Peru" || form.countryspouse.value == "Philippines" || form.countryspouse.value == "South Korea" || form.countryspouse.value == "United Kingdom" || form.countryspouse.value == "Vietnam"))
{
    spouse = 0;
}

if((form.countrydad.value == "Bangladesh" || form.countrydad.value == "Brazil" || form.countrydad.value == "Canada" || form.countrydad.value == "China" || form.countrydad.value == "Colombia" || form.countrydad.value == "Dominican Republic" || form.countrydad.value == "Ecuador" || form.countrydad.value == "El Salvador" || form.countrydad.value == "Haiti" )|| (form.countrydad.value == "India" || form.countrydad.value == "Jamaica" || form.countrydad.value == "Mexico" || form.countrydad.value == "Nigeria" || form.countrydad.value == "Pakistan" || form.countrydad.value == "Peru" || form.countrydad.value == "Philippines" || form.countrydad.value == "South Korea" || form.countrydad.value == "United Kingdom" || form.countrydad.value == "Vietnam"))
{
    dad = 0;
}

if((form.countrymom.value == "Bangladesh" || form.countrymom.value == "Brazil" || form.countrymom.value == "Canada" || form.countrymom.value == "China" || form.countrymom.value == "Colombia" || form.countrymom.value == "Dominican Republic" || form.countrymom.value == "Ecuador" || form.countrymom.value == "El Salvador" || form.countrymom.value == "Haiti" )|| (form.countrymom.value == "India" || form.countrymom.value == "Jamaica" || form.countrymom.value == "Mexico" || form.countrymom.value == "Nigeria" || form.countrymom.value == "Pakistan" || form.countrymom.value == "Peru" || form.countrymom.value == "Philippines" || form.countrymom.value == "South Korea" || form.countrymom.value == "United Kingdom" || form.countrymom.value == "Vietnam"))
{
    mom = 0;
}

if(form.education.value == "noeducation")
{
    educ = 0;
}

if(form.occupation.value == "None")
{
    work = 0;
}

if(((educ + work) == 0 )||((self + spouse + parents) == 0 ))
{
    alert("Sorry, you are ineligible.");
}else
{
    alert("You are eligible.");
}
    }

---

“父项”未定义

如果您在控制台中查看，看起来您在

If

语句中使用了“parents”，但它不存在

如果删除

父项

或添加

var parents=1它会工作的

您还应该查看
if
语句。您使用的是单个equals
=
而不是双
=
或三个
==
equals

Single将设置一个值，double和triple将进行比较-唯一的区别是，对于triple，它们也必须是相同的类型才能返回true

e、 g

你能为你的代码创建JSFIDLE吗？
validateform
是一个函数，你用什么来调用这个函数？由于您在
if
和
else
中有一个警报，如果您都没有得到，那么您的函数很可能没有被调用。@wf4，我正在“提交”按钮中调用该函数。它在一个角落里。它是工作之前，只有警报是在功能，然后当我添加这个，没有弹出窗口发生。if语句中的条件是否有限制？没有限制-可能存在某种逻辑错误谢谢，我想我只是没有注意到，我真的应该更耐心地检查语法错误。：）
1 = 1      -- will set int 1 with a value of 1
1 == "1"   -- will return true (int compared to a string)
1 === "1"  -- will return false (int compared to a string)