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

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

1 var a = "我";
2 console.log(a.charCodeAt()); //25105
3 console.log(a.charCodeAt().toString(2)); //110001000010001

1 var a = "我们";
2 console.log(a.length); //2
3 var list = a.split("");
4 console.log(list.length); //2<br>console.log(a.charCodeAt().toString(2)); //110001000010001 100111011101100

 1 //将字符串转换成二进制形式，中间用空格隔开
 2 function strToBinary(str){
 3     var result = [];
 4     var list = str.split("");
 5     for(var i=0;i<list.length;i++){
 6         if(i != 0){
 7             result.push(" ");
 8         }
 9         var item = list[i];
10         var binaryStr = item.charCodeAt().toString(2);
11         result.push(binartStr);
12     }   
13     return result.join("");
14 }
15  
16 console.log(strToBinary("我们")); //110001000010001 100111011101100
17 console.log(strToBinary("@%$+")); //1000000 100101 100100 101011
18  
19 //将二进制字符串转换成Unicode字符串
20 function binaryToStr(str){
21     var result = [];
22     var list = str.split(" ");
23     for(var i=0;i<list.length;i++){
24          var item = list[i];
25          var asciiCode = parseInt(item,2);
26          var charValue = String.fromCharCode(asciiCode);
27          result.push(charValue);
28     }
29     return result.join("");
30 }
31  
32 console.log(binaryToStr("110001000010001 100111011101100")); //我们
33 console.log(binaryToStr("1000000 100101 100100 101011")); //@%$+