我试图比较一个简单的代码，如果用户点击按钮，输出将显示适当的答案，但我似乎找不到任何正确的方法。
<!DOCTYPE html>
<html>
<body>
<p>Gender</p>
<label><input type="radio" name="gender" id="male" value="Male">Male</label>
<label><input type="radio" name="gender" id="male" value="Female">Female</label>
<br>
<br>
<button onclick="myFunction()">Try it</button>
<p id="demo">
<script>
function myFunction() {
var x = document.getElementById("demo").value;
var m = document.getElementById("male").value;
var f = document.getElementById("female").value;
if(x === m)
x.innerHTML = "You are male.";
else if(x === f)
x.innerHTML = "You are female.";
}
</script>
</body>
</html>最佳答案
你想要像下面这样的东西:
<html>
<body>
<p>Gender</p>
<label><input type="radio" name="gender" id="male" value="Male">Male</label>
<label><input type="radio" name="gender" id="female" value="Female">Female</label>
<br>
<br>
<button onclick="myFunction()">Try it</button>
<p id="demo">
<script>
function myFunction() {
var x = document.getElementById("demo");
var m = document.getElementById("male").checked;
var f = document.getElementById("female").checked;
if (m)
x.innerHTML = "You are male.";
else if (f)
x.innerHTML = "You are female.";
}
</script>
</body>
</html>首先你有两个男性输入的id，你希望女性输入是女性:
<label><input type="radio" name="gender" id="female" value="Female">Female</label>
其次，您想知道单选按钮是否被选中，而不是它的值:
var m = document.getElementById("male").value; // returns Male in your case
var m = document.getElementById("male").checked; // returns true or false depending on whether it's been checked
那么逻辑需要一点改动:
if (m) // they selected male
x.innerHTML = "You are male.";
else if (f) // they selected female
x.innerHTML = "You are female.";
关于javascript - 如何在 Javascript 中比较 id，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/61865962/