parseQueryString method
解析查询字符串 取出参数
Implementation
Map<String, List<String>> parseQueryString(String query) {
var search = RegExp('([^&=]+)=?([^&]*)');
var params = Map<String, List<String>>();
if (query.startsWith('?')) query = query.substring(1);
///
decode(String s) => Uri.decodeComponent(s.replaceAll('+', ' '));
for (Match match in search.allMatches(query)) {
String key = decode(match.group(1)!);
String value = decode(match.group(2)!);
if (params.containsKey(key)) {
params[key]!.add(value);
} else {
params[key] = [value];
}
}
return params;
}