使用Javascript比较HTML中的两个输入数字？ [英] Using Javascript to compare two input numbers in HTML?
问题描述
我使用Notepad ++创建一个简单的网页，用户在两个数字中键入一个文本框，然后按下一个按钮。当他们按下按钮时会出现一些信息，告诉他们第一个或第二个数字是否更大。我有下面的代码，但不能得到任何东西来。有谁知道最新错误？
$ b $
<！DOCTYPE html PUBLIC - // W3C // DTD XHTML 1.0 Strict // EN< head>
http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd\">
< meta http-equiv =content-typecontent =text / html; charset = utf-8/>
< title>作业10表格< /标题>
< script type =text / javascript>
函数greaterNum（）{
var value1;
var value2;
value1 = document.First_num.value;
value2 = document.last_num.value;
if（value1> value2）{
alert（'值1大于值2'）;
document.body.style.background =orange;
}
}
< / script>
< style type =text / css>
body {background-color：＃40FF00;
margin-left：auto;
margin-right：auto;
宽度：60％;
}
#container {
border：2px纯黄色;
padding：20px;
}
< / style>
< / head>
< body>
< h1>作业10< / h1>
< div id =container>
< div class =Num>
< form>
< label class =label1>输入值1：< / label>
< input type =textname =First_numvalue =/>
< label class =label1>输入值2：< / label>
< input type =textname =last_numvalue =/>
< br />
< input type =buttonvalue =哪个数字更大？onclick =greaterNum（）; />
< / form>
< / body>
< / html>
来自输入的值被检索为字符串，您需要将其转换为数字。试试这个：
value1 = + document.First_num.value;
value2 = + document.last_num.value;
另外，为输入命名时要保持一致性，为什么要为一个和另一个小写字母上限？
I am using Notepad++ to create a simple web page where a user types in two numbers into a text box, and then presses a button. When they press the button something comes up that tells them whether the first or second number is greater. I have the following code but cant get anything to come up. Does anyone know whats wrong?
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en">
<head>
<meta http-equiv="content-type" content="text/html;charset=utf-8" />
<title>Assignment 10 Form</title>
<script type="text/javascript">
function greaterNum(){
var value1;
var value2;
value1 = document.First_num.value;
value2 = document.last_num.value;
if (value1 > value2){
alert('Value 1 is greater than value 2');
document.body.style.background = "orange";
}
}
</script>
<style type="text/css">
body{background-color: #40FF00;
margin-left: auto;
margin-right: auto;
width: 60%;
}
#container{
border: 2px solid yellow;
padding: 20px;
}
</style>
</head>
<body>
<h1>Assignment 10</h1>
<div id="container">
<div class="Num">
<form>
<label class="label1">Enter Value 1:</label>
<input type="text" name="First_num" value=" " />
<label class="label1">Enter Value 2:</label>
<input type="text" name="last_num" value=" " />
<br/>
<input type="button" value=" Which number is greater? " onclick="greaterNum();" />
</form>
</body>
</html>
Values from inputs are retrieved as strings, you need to convert it to number. Try this:
value1 = +document.First_num.value;
value2 = +document.last_num.value;
Also, try to be consistent when naming your input, why caps for one and lowercase for the other?
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