JS字符串与二进制的相互转化

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//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

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

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

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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

 

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//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(binaryStr);     }        return result.join(""); }   console.log(strToBinary("我们")); //110001000010001 100111011101100 console.log(strToBinary("@%$+")); //1000000 100101 100100 101011   //将二进制字符串转换成Unicode字符串 function binaryToStr(str){     var result = [];     var list = str.split(" ");     for(var i=0;i<list.length;i++){          var item = list[i];          var asciiCode = parseInt(item,2);          var charValue = String.fromCharCode(asciiCode);          result.push(charValue);     }     return result.join(""); }   console.log(binaryToStr("110001000010001 100111011101100")); //我们 console.log(binaryToStr("1000000 100101 100100 101011")); //@%$+

 

const left_pad = (str, len, ch)  => {//补全左边
    str = str + '';
    len = len - str.length;
    if (len <= 0) return str;

    if (!ch && ch !== 0) ch = ' ';
    ch = ch + '';
    var pad = '';
    
    while (true) {
        if (len & 1) pad += ch;
        len >>= 1;
        if (len) ch += ch;
        else break;
    }
    return pad + str;
}

left_pad('1011', 8, '0') //00001011

　　参考出处：http://www.cnblogs.com/it-deepinmind/

　　

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//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

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

　　

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

　　

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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

　　

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//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("@%$+")); //1000000 100101 100100 101011   //将二进制字符串转换成Unicode字符串 function binaryToStr(str){     var result = [];     var list = str.split(" ");     for(var i=0;i<list.length;i++){          var item = list[i];          var asciiCode = parseInt(item,2);          var charValue = String.fromCharCode(asciiCode);          result.push(charValue);     }     return result.join(""); }   console.log(binaryToStr("110001000010001 100111011101100")); //我们 console.log(binaryToStr("1000000 100101 100100 101011")); //@%$+