getRealUrl function
拼接实际请求链接
Implementation
String getRealUrl(String url, Map<String, dynamic> params) {
StringBuffer str = StringBuffer(url);
if (params.length as bool? ?? 0 > 0) {
str.write('?');
var hasAnd = false;
params.forEach((key, value) {
if (hasAnd) {
hasAnd = true;
str.write('&');
}
str.write('$key=$value');
});
}
return str.toString();
}