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有没有区别:
<form action="">
... 和:
<form action=".">
?
空字符串通常表示当前 url(例如,http://example.com/a/test.html) '.'- 当前的“目录”(例如,http://example.com/a/)
http://example.com/a/test.html
'.'
http://example.com/a/