JavaScript字符串与二进制相互转换详解

//字符串转ascii码，用charCodeAt();
//ascii码转字符串，用fromCharCode();
var str = "A";
var code = str.charCodeAt();
var str2 = String.fromCharCode(code);

var a = "i";
console.log(a.charCodeAt()); //105
console.log(a.charCodeAt().toString(2)); //1101001

var a = "我";
console.log(a.charCodeAt()); //25105
console.log(a.charCodeAt().toString(2)); //110001000010001 
　
var a = "我们";
console.log(a.length); //2
var list = a.split("");
console.log(list.length); //2<br>console.log(a.charCodeAt().toString(2)); //110001000010001 100111011101100 
　　
//将字符串转换成二进制形式，中间用空格隔开
function strToBinary(str){
  var result = [];
  var list = str.split("");
  for(var i=0;i<list.length;i++){
    if(i != 0){
      result.push(" ");
    }
    var item = list[i];
    var binaryStr = item.charCodeAt().toString(2);
    result.push(binartStr);
  }  
  return result.join("");
}
console.log(strToBinary("我们")); //110001000010001 100111011101100
console.log(strToBinary("@%$+")); //1000000 100101 100100 101011
//将二进制字符串转换成Unicode字符串
function binaryToStr(str){
  var result = [];
  var list = str.split(" ");
  for(var i=0;i<list.length;i++){
     var item = list[i];
     var asciiCode = parseInt(item,2);
     var charValue = String.fromCharCode(asciiCode);
     result.push(charValue);
  }
  return result.join("");
} 
console.log(binaryToStr("110001000010001 100111011101100")); //我们
console.log(binaryToStr("1000000 100101 100100 101011")); //@%$+  

//将字符串转化为二进制的数据
function strToBinary(str){
  var result = [];
  var list = str.split("");
  for(var i=0;i<list.length;i++){
    if(i != 0){
      //加空格，分割二进制
      result.push(" ");
    }
    var item = list[i];
    //将字符串转化为二进制数据
    var binaryStr = item.charCodeAt().toString(2);
    result.push(binaryStr);
  }  
  return result.join("");
}

//二进制转为字符串
function binaryToStr(str){
  var result = [];
  //
  //通过空格来分开二进制的字符
  var list = str.split(" ");
  for(var i=0;i<list.length;i++){
     var item = list[i];
     //转为asciicode 码
     var asciiCode = parseInt(item,2);
     //转为文字
     var charValue = String.fromCharCode(asciiCode);
     //添加到集合中
     result.push(charValue);
  }
  //返回结果
  return result.join("");
}