[Web基础]URI的字符组成
uric = reserved | unreserved | escaped (1) reserved = ";" | "/" | "?" | ":" | "@" | "&" | "=" | "+" | "$" | "," (2) unreserved= alphanum | mark mark = "-" | "_" | "." | "!" | "~" | "*" | "'" | "(" | ")"(3) 除以上的字符外，均是： escaped = "%" hex hex hex = digit | "A" | "B" | "C" | "D" | "E" | "F" | "a" | "b" | "c" | "d" | "e" | "f" 由上述可知：当提交的表单中，含有的字符1.属于情况(3)时，需要UrlEncode；2.属于情况(1)时，需要UrlEncode，因为作为query的value部分，当然不能有reserved字符；3.属于情况(2)时，不需要UrlEncode。不过，对(2)的mark字符，有些浏览器选择性地对它们进行了UrlEncode。参考：http://www.faqs.org/rfcs/rfc2396.html
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