javascript - 无法输出值: JavaScript

Question

我试图在文本框中输入一个数字，并通过 switch 功能在另一个 div 标签中将消息显示为当天的名称。我传递给 switch 函数的变量必须从文本框中获取值。但我无法在单击按钮时输出该函数，它显示消息“未定义”。 请帮助 :)。谢谢

<input type = "text" id = "test" />
<br>
<div id="box3" style = "border:solid 2px blue; height:15px;width:100px;"></div>
<br>
<input type = "button" onClick = "myTest()" value = "Click me" />

<script type="text/javascript">
function myTest(){
var x;
var d =document.getElementById('test').value;
switch (d)
{
case 0:
x="Today it's Sunday";
break;
case 1:
x="Today it's Monday";
break;
case 2:
x="Today it's Tuesday";
break;
case 3:
x="Today it's Wednesday";
break;
case 4:
x="Today it's Thursday";
break;
case 5:
x="Today it's Friday";
break;
case 6:
x="Today it's Saturday";
break;
}
document.getElementById('box3').innerHTML=x;
}

</script>

Answer 1

您需要先将其转换为整数:

var d = parseInt(document.getElementById('test').value);