DIV CSS 佈局教程網

 DIV+CSS佈局教程網 >> 網頁腳本 >> JavaScript入門知識 >> 關於JavaScript >> javascript實現的字符串與十六進制表示字符串相互轉換方法
javascript實現的字符串與十六進制表示字符串相互轉換方法
編輯:關於JavaScript     

本文實例講述了javascript實現的字符串與十六進制表示字符串相互轉換方法。分享給大家供大家參考。具體如下:

之所以寫這個,是因為發現SQL注入和XSS中經常利用十六進制表示的字符串,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>

希望本文所述對大家的javascript程序設計有所幫助。

XML學習教程| jQuery入門知識| AJAX入門| Dreamweaver教程| Fireworks入門知識| SEO技巧| SEO優化集錦|
Copyright © DIV+CSS佈局教程網 All Rights Reserved