JavaScript page implementation code integrated with multiple search engines_javascript skills

- Enter a keyword and click the search engine link behind it to enter the page of that engine
- If you enter the keyword and press Enter, the default search engine will be used. Every time you select a new search engine, the default search engine will be used. The engine will also change accordingly
- automatically remember the last used search engine, add *

The source code is as follows, using a variety of IE/FF adaptation methods:

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