我正在研究Url解码和编码系统。但是出于某种奇怪的原因,它只会解码/编码某些字符串。另外,当字符串中包含一定的片段时,似乎可以对字符串进行解码/编码。很难解释,但是对于什么可能行不通却很困惑。我试图找出问题所在,但这只会使整个问题看起来更加不合逻辑,而不是合乎逻辑。
我希望有人可以帮助我。有了解释。如果代码与样式相同,我也希望如此。
我也知道在线上可能有一些软件包可以轻松地做到这一点,但我宁愿自己做。这是我可以进一步练习JS的方式。
// I know I don't have all the characters markek. I am doing that later
var Url = {
filterEncode : ["%2B","%3A","%3D","%3F","%2F","%26","%252F","%253A","%253D","%253F","%252B"],
filterDecode : ["+",":","=","?","/","&","%2F","%3A","%3D","%3F","%2B"],
decode : function(decodeText){
let returnString, a, b;
let filterEncode = Url.filterEncode;
let filterDecode = Url.filterDecode;
for (a = 0; a < filterEncode.length; a++){
let regexEn = new RegExp(filterEncode[a],"g");
let regexDe = new RegExp("/" + filterDecode[a],"g");
let regex = new RegExp(regexEn,"g");
let array = (decodeText.match(regex) || []).length
for (b = 0; b < array; b++){
returnString = decodeText.replace(filterEncode[a],filterDecode[a]);
decodeText = returnString;
}
}
return returnString;
},
encode : function(encodeText){
let returnString, a, b;
let filterEncode = Url.filterEncode;
let filterDecode = Url.filterDecode;
for (a = 0; a < filterEncode.length; a++){
let regexEn = new RegExp("[" + filterEncode[2] + "]","g");
let regexDe = new RegExp("[" + filterDecode[2] + "]","g");
let regex = new RegExp(regexEn,"g");
let array = (encodeText.match(regex) || []).length;
for (b = 0; b < array; b++){
returnString = encodeText.replace(filterDecode[a],filterEncode[a]);
encodeText = returnString;
}
}
return returnString;
}
}
// Saying it is undefined
console.log(Url.encode("="));
// Encodes it just find
console.log(Url.encode("%3F"));
// Encodes both of them but for some odd reason encodes the
// equal sign twice.
console.log(Url.encode("%3F ="));
我确实希望一切都清楚我的问题所在。我通常会尝试在这里搜索答案,但是这个问题太混乱了,我不知道我应该搜索什么。
谢谢!
答案 0 :(得分:2)
filterDecode
中的某些字符串作为正则表达式具有特殊含义。将字符串转换为正则表达式时,您需要将每个字符包装在[]
中,以便在字面上进行匹配。
创建/
时不需要串联regexDe
。
不需要for(b...)
循环。在replace()
调用中使用正则表达式,由于它带有g
标志,它将立即执行所有替换。
将包含%
的编码字符串放在数组的开头。否则,当将类似=
的内容编码为%3D
时,外部循环的后续迭代会将其重新编码为%253D
。您只想对它进行编码(如果它在原始字符串中),而不是中间步骤。
var Url = {
filterDecode: ["%252F", "%253A", "%253D", "%253F", "%252B", "%2B", "%3A", "%3D", "%3F", "%2F", "%26"],
filterEncode: ["%2F", "%3A", "%3D", "%3F", "%2B", "+", ":", "=", "?", "/", "&"],
strToRe: function(str) {
let reStr = str.split("").map(c => '[' + c + ']').join('');
return new RegExp(reStr, "g");
},
decode: function(decodeText) {
let a;
let filterEncode = Url.filterEncode;
let filterDecode = Url.filterDecode;
for (a = 0; a < filterDecode.length; a++) {
decodeText = decodeText.replace(Url.strToRe(filterDecode[a]), filterEncode[a]);
}
return decodeText;
},
encode: function(encodeText) {
let a, b;
let filterEncode = Url.filterEncode;
let filterDecode = Url.filterDecode;
for (a = 0; a < filterEncode.length; a++) {
encodeText = encodeText.replace(Url.strToRe(filterEncode[a]), filterDecode[a]);
}
return encodeText;
}
}
console.log(Url.encode("="));
console.log(Url.decode("%3D"));
console.log(Url.encode("%3F"));
console.log(Url.decode("%253F"));
console.log(Url.encode("%3F ="));
console.log(Url.decode("%253F %3D"));