为什么 "decodeURIComponent" 或 "decodeURI" 无法在 JavaScript 中将 "hello+world" 解码为 "hello world"？
Why can't "decodeURIComponent" or "decodeURI" decode "hello+world" to "hello world" in JavaScript?
据此：
http://en.wikipedia.org/wiki/Query_string#URL_encoding
“+”是一个有效的 URL 编码标记。
如果是这样，为什么 decodeURIComponent 或 decodeURI 不能将 "hello+world" 解码为 "hello world"？
如果“+”有效，那么JavaScript中肯定有一个内置函数可以将"hello+world"转换为"hello world"？
The behavior of decideURIComponent is defined as "inverse" 运算 encodeURIComponent:
The decodeURIComponent function computes a new version of a URI in which each escape sequence and UTF-8 encoding of the sort that might be introduced by the encodeURIComponent function is replaced with the character that it represents.
而encodeURIComponent并不是用+代替空格，而是用%20.
（类似于 decodeURI）
If "+" is valid, surely, there has to be a built-in function in JavaScript that can convert "hello+world" to "hello world"?
当然有：
"hello+world".replace(/\+/g, ' ');
因为 encodeURIComponent 会将 space 编码为 %20，所以你会得到 hello%20world。如果你想替换 + 个字符，我建议使用正则表达式
据此：
http://en.wikipedia.org/wiki/Query_string#URL_encoding
“+”是一个有效的 URL 编码标记。
如果是这样，为什么 decodeURIComponent 或 decodeURI 不能将 "hello+world" 解码为 "hello world"？
如果“+”有效，那么JavaScript中肯定有一个内置函数可以将"hello+world"转换为"hello world"？
The behavior of decideURIComponent is defined as "inverse" 运算 encodeURIComponent:
The
decodeURIComponentfunction computes a new version of aURIin which each escape sequence and UTF-8 encoding of the sort that might be introduced by theencodeURIComponentfunction is replaced with the character that it represents.
而encodeURIComponent并不是用+代替空格，而是用%20.
（类似于 decodeURI）
If "+" is valid, surely, there has to be a built-in function in JavaScript that can convert "hello+world" to "hello world"?
当然有：
"hello+world".replace(/\+/g, ' ');
因为 encodeURIComponent 会将 space 编码为 %20，所以你会得到 hello%20world。如果你想替换 + 个字符，我建议使用正则表达式