在javascript中从十进制转换为八进制，二进制和十六进制 [英] Conversion from Decimal to octal, binary and hexadecimal in javascript
本文介绍了在javascript中从十进制转换为八进制，二进制和十六进制的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我有一个表单，用户输入一个十进制数字，然后从他选择的下拉菜单中选择是否要通过单击转换按钮将其转换为二进制，八进制或十六进制。新答案应以新形式显示，例如：二进制数字是......。但是，我所做的代码似乎不起作用。任何帮助将受到高度赞赏。这是我到目前为止的代码：
I have a form where a user enters a decimal number and then from the dropdown menu he chooses if he wants to convert it either to binary, octal or hexadecimal by clicking on a convert button. The new answer should be displayed in a new form saying for example: "the number in binary is....". However the code I've done doesn't seem to work. Any help would be highly appreciated. This is the code I have so far:
<html>
<head>
<title> Convertor </title>
<style>
.panel {
width:400px;
height:160px;
background-color: #E6E6FA;
border:2px solid blue;
font-weight: bold;
font-size: 110%;
margin-left:30px;
margin-top:15px;
}
p {
margin-left: 30px;
margin-top: 15px;
}
form {
margin-left: 30px;
margin-top: 15px;
}
button {
margin-left:40px;
margin-top:10px;
}
.answer {
width:400px;
height:90px;
background-color: #E6E6FA;
border:2px solid blue;
font-weight: bold;
font-size: 110%;
margin-left:30px;
margin-top:15px;
}
form {
margin-left: 70px;
margin-top: 65px;
}
</style>
</head>
<body>
<div class="panel">
<p>
Enter decimal number to convert, select Base and click CONVERT.
</p>
<form>
<input type="text">
<select id="selectid" name="selectname">
<option value="binary">Binary</option>
<option value="octal">Octal</option>
<option value="hexadecimal">Hexadecimal</option>
</select>
<button id="button1" name="Button1" onclick="Answer()"> Convert
</button>
</form>
</div>
<div class="answer">
<form>
</form>
</div>
<script>
function Answer() {
if (document.getElementbyId ('selectid').value=="binary") {
this.value=this.value.toString(2);
}
else if (document.getElementbyId ('selectid').value=="octal") {
this.value=this.value.toString(8);
}
else if (document.getElementbyId ('selectid').value=="hexadecimal") {
this.value=this.value.ToString(16);
}
}
</script>
</body>
推荐答案
十进制到十六进制 / oct / bin ：
Decimal to hex/oct/bin:
var hex = (100).toString(16); // "64"
var oct = (100).toString(8); // "144"
var bin = (100).toString(2); // "1100100"
同样倒退：
var dec = parseInt("64",16); // 100
var dec = parseInt("144",8); // 100
var dec = parseInt("1100100",2); // 100
这篇关于在javascript中从十进制转换为八进制，二进制和十六进制的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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