JS字符串与二进制的相互转化

//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);

　　十进制转二进制

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
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")); //@%$+  

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