求助：将用户输入存入变量并用于if语句的代码无法运行

Hey there! Let's get your code working properly—there are two key issues tripping it up right now:

• JavaScript is case-sensitive! You used document.GetElementById("x"), but the correct method name is document.getElementById("x") (note the lowercase g). That's why your code can't locate the input element in the first place.
• Input values are strings by default. The value property of a number input returns a string, not a numeric value. If you compare a string directly to a number (like "30" >= 35), JavaScript will do unexpected string-based comparisons (e.g., "4" >= "35" would incorrectly evaluate to true because of character ASCII values). You need to convert the value to a number first using parseInt() or Number().

Here's the corrected code that addresses both issues:

<input type="number" id="x"/> 
<button onclick="calc();">try</button> 
<script> 
function calc() { 
  // Fix the method name and convert value to a number
  var age = parseInt(document.getElementById("x").value); 
  if (age >= 35) { 
    alert("you are old enough"); 
  } else { 
    alert("you are too young"); 
  } 
} 
</script>

Alternatively, you could use Number(document.getElementById("x").value) instead of parseInt()—both work well for converting the input string to a number here.

内容的提问来源于stack exchange，提问作者Ali Jafari