我发现这个奇怪的JavaScript我无法理解. for循环有一个奇怪的语法(很多参数),你能解释一下它是如何工作的吗?谢谢
decode: function(s){
for(var a, b, i = -1, l = (s = s.split("")).length, o = String.fromCharCode, c = "charCodeAt"; ++i < l;
((a = s[i][c](0)) & 0x80) &&
(s[i] = (a & 0xfc) == 0xc0 && ((b = s[i + 1][c](0)) & 0xc0) == 0x80 ?
o(((a & 0x03) << 6) + (b & 0x3f)) : o(128), s[++i] = "")
);
return s.join("");
}
解决方法:
有趣的功能,显然是对一组字符进行转码,一种深奥的,只能使用ASCII码,但这里是细分:
for (var i = 0; i < s.length; i++) {
var a = s.charCodeAt(i);
if (a & 0x80) { // (a >= 128) if extended ascii
var b = s.charCodeAt(i + 1);
var specialA = (a & 0xfc) === 0xc0; // a IS [À, Á, Â or Ã] essentially [192, 193, 194, 195]
var specialB = (b & 0xc0) === 0x80; // b >= 128 & b <= 191 eg. b is not a special Latin Ascii Letter
if (specialA && specialB) {
var txA = (a & 0x03) << 6; // [0, 64, 128, 192]
var txB = b & 0x3f; // 0 - 63
s[i] = String.fromCharCode(txA + txB);
} else {
s[i] = String.fromCharCode(128);
s[++i] = "";
}
}
}
希望这有帮助,无论哪种方式,我发现解码有趣,提醒阅读原始汇编程序,哈哈 – 克