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
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"
));
//@%$+