javascript实现的字符串与十六进制表示字符串相互转换方法

2019-11-20 12:01:49

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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>

希望本文所述对大家的javascript程序设计有所帮助。

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