为什么不显示第二个警报

Question

I have a little program that checks if a email address contains the right elements, but it doesn't show the box that gives conformation.

 $(document).ready(function(){ $("#sendButton").click(function(){ var name = $("#name").val(); var email = $("#email").val(); if (email.indexOf('@') === -1) { alert("Please enter a valid email."); return; } if ((email.indexOf(".com") === -1)) { alert("Please enter a valid email."); return; } alert(`Thank you ${name}, There has been sent a conformation to ${email}.`); }); });

 <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> <p><label for="name">Name:</label><input id="name"></p> <p><label for="email">Email:</label><input id="email"></p> <p><button type="button" id="sendButton">Send</button></p>

Is there someone who knows how to show the "Thank you" alert box?

Answer 1

The posted code works just fine and looks good to me. I think you might be using an old browser (ie probably Internet Explorer) which doesn't support template strings (these ${variableName} symbols inside your message) and multiline strings. You can change the last alert to something like this:

alert("Thank you " + name + ", There has been sent a conformation to  " + email + ".");

It's basically equal to your existing code, but is compliant with the older version of the standard.

Answer 2

我通过删除 if 语句中的 return 语句解决了这个问题，并将这个 return 语句放在函数的末尾。