java脚本错误抛出异常

Question

当我输入一些数字时，它不显示任何数字。我试图在我的site上插入此代码，但无法正常工作。请帮我

function myFunction() { 
 
    var message, x; 
 
    message = document.getElementBy("message"); 
 
    message.innerHTML = ""; 
 
    x = document.getElementById("demo").value; 
 
    try { 
 
     if(x == "") throw "empty"; 
 
     if(isNaN(x)) throw "not a number"; 
 
     x = Number(x); 
 
     if(x < 5) throw "too low"; 
 
     if(x > 10) throw "too high"; 
 
    } 
 
    catch(err) { 
 
     message.innerHTML = "Input is " + err; 
 
    } 
 
}

<p>Please input a number between 5 and 10:</p> 
 

 
<input id="demo" type="text"> 
 
<button type="button" onclick="myFunction()">Test Input</button> 
 
<p id="message"></p>

Answer 1

您没有正确选择的元素，应该说 message = document.getElementById("message");