JavaScript转换二进制编码为ASCII码的方法

2019-11-20 12:39:08

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本文实例讲述了JavaScript转换二进制编码为ASCII码的方法。分享给大家供大家参考。具体如下：

<html><head><script type="text/javascript">var input_id = "bin_text";var answer_id = "answer";function convertToASCII() { var bin_text = document.getElementById(input_id); var answer = document.getElementById(answer_id); if (!answer) {  alert("Error: No element with id /""+answer_id+"/".");  return; } if (bin_text)  var text = bin_text.value; else {  error("No element with id /""+input_id+"/".");  return; } var divisible = text.length % 8; var nonBinary = /[^0|1]/.test(text); if (text.length > 0 && divisible == 0 && !nonBinary) {  var regex = /[0|1]{8}/g;  var str = text.match(regex);  var code = 0;  var placeVal, exp, digit;  var ascii = '';  while (str.length > 0) {   code = 0;   for (var i=0; i<str[0].length; i++) {    placeVal = 7-i;    exp = Math.pow(2, i);    digit = str[0].charAt(placeVal);    code += exp*digit;   }   str.shift();   ascii += String.fromCharCode(code);  }  answer.innerHTML = "<p class=/"binary/">" + ascii + "</p>"; } else {  error("Malformed binary.");  return; } function error(errText) {  answer.innerHTML = "<span class=/"error/">Error: " +   errText + "</span>"; }}</script><style type="text/css">.block { width: 45%; border: 1px solid #000000; padding: 10px;}.binary { background-color: #C6FFC7; padding: 3px;}.error { background-color: #FFC6C6; padding: 3px;}</style></head><body><div style="float:left;" class="block"> <form onSubmit="convertToASCII(); return false;">  <p>Enter some binary to decode:</p>  <input type="text" id="bin_text"/> </form></div><div style="float:right;" class="block"> <p id="answer"><br/></p></div></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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