javascript实现的字符串与十六进制表示字符串相互转换方法
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2020-12-30
00:35:05
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javascript实现的字符串与十六进制表示字符串相互转换方法实现的字符串与十六进制表示字符串相互转换方法
本文实例讲述了javascript实现的字符串与十六进制表示字符串相互转换方法。分享给大家供大家参考。具体如下：
之所以写这个，是因为发现SQL注入和XSS中经常利用十六进制表示的字符串，比如
SELECT CONCAT(0x68656c6c6f);
得到的是hello
<!DOCTYPE html>
<html>
<head>
<title>Hex-Char Bi-Converter</title>
</head>
<body>
<div class="mainContainer">
<label for="from" id="fromLabel">String</label>
<input type="text" name="from" id="from" />
<input type="button" name="exchange" id="exchange" value="<=>" />
<label for="to" id="toLabel">Hex</label>
<input type="text" name="to" id="to" />
<input type="button" name="convert" id="convert" value="Convert" />
</div>
<script type="text/javascript" src="js/jquery-1.9.1.min.js"></script>
<script type="text/javascript">
var curMode = 0; // curMode: 0 represents String to Hex, 1 from Hex to String
var fromToLabelArray = ["Hex", "String"];
$(function() {
$("#convert").click(function() {
var fromVal = $("#from").val();
var toVal =
curMode === 0
?
strToHexCharCode(fromVal)
:
hexCharCodeToStr(fromVal);
$("#to").val(toVal);
});
$("#exchange").click(function() {
$("#fromLabel").text(fromToLabelArray[curMode]);
$("#toLabel").text(fromToLabelArray[1-curMode]);
curMode = 1 - curMode;
});
});
function strToHexCharCode(str) {
if(str === "")
return "";
var hexCharCode = [];
hexCharCode.push("0x");
for(var i = 0; i < str.length; i++) {
hexCharCode.push((str.charCodeAt(i)).toString(16));
}
return hexCharCode.join("");
}
function hexCharCodeToStr(hexCharCodeStr) {
var trimedStr = hexCharCodeStr.trim();
var rawStr =
trimedStr.substr(0,2).toLowerCase() === "0x"
?
trimedStr.substr(2)
:
trimedStr;
var len = rawStr.length;
if(len % 2 !== 0) {
alert("Illegal Format ASCII Code!");
return "";
}
var curCharCode;
var resultStr = [];
for(var i = 0; i < len;i = i + 2) {
curCharCode = parseInt(rawStr.substr(i, 2), 16); // ASCII Code Value
resultStr.push(String.fromCharCode(curCharCode));
}
return resultStr.join("");
}
</script>
</body>
</html>
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