Description: Please add a local object to the Array prototype method, which uses an array of entries is to delete duplicate entries (there may be multiple), the return value is one that contains only duplicate entries deleted new array. The use of regular expressions, analytical form (2003-12-05) short date, month, day to get that date. And use the date Date object constructor requires the user to enter a user name in the text box to submit, if the text box is empty, uncommit use checkboxes allow users to choose their hobbies, outputs the user selected content use of radio button allows the user to select their gender, outputs the user selected content use hidden controls, designed to determine the user input verification code
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