Question

在程序中，我试图接受用户的拒绝并在标签上显示不是正面或负面如何指定标签？

<html>
	<Head>
		<title>	If Else Demo Program</title>
		
<style>
thead {color:green;}
tbody {color:green;}
tfoot {color:red;}

table{
   	border: 1px solid black;
	border-color:red;
}
#No1{
	background-color:lightyellow;
}
tr{
	border:1px solid black;
	border-color:pink;
}
td{
	border:1px solid black;
	border-color:gray;
}
</style>

</Head>
		<body>
		<table>
		<thead>
		<tr>
			<td>Enter a no</td>
			<td><input type="text" name="No1" id="No1"><br></td>
		</tr>
		</thead>
		<tbody>
		<tr>
			<td>
				<h3>Body section with green color</h3>
			</td>
			<td><label for="Output" name="lblMessage" id="Message">output</label> </td>
		</tr>
		</tbody>
		<tr>
		<tbody>
			<td>
				<input type="Submit" onclick="Demo()">
			</td>
		</tbody>
		</tr>
		
		</table>
		
		<script type="Text/JavaScript" lang="JavaScript">
		function Demo()
		{
			var No1=parseInt(document.getElementById("No1").value);
		
			if(No1>0)
				document.getElementById("Message").InnerHTML=("Positve No ",No1);
			else
				document.getElementById("Message").InnerHTML=("Negative No ",No1);
		
		}
		</script>
		
		</body>
</html>

Answer 1

你有一个小的语法错误，InnerHTML实际上应该是innerHTML。也是一个重构建议。

    function Demo() {

       var No1 = parseInt(document.getElementById("No1").value);
       var Message =   document.getElementById("Message");

       if ( No1 > 0 ) {
            Message.innerHTML = "Positive number " + No1;
       } else {
           Message.innerHTML = "Negative number " + No1;
       }
    }

Answer 2

if(num1>0)
    document.getElementById("message").innerHTML=("Positve No " + num1);
else
    document.getElementById("message").innerHTML=("Negative No "+ num1);

InnerHTML应为innerHTML并使用+组合两个值。

Html使用javascript显示标签上的输出

2 个答案: