<!DOCTYPE html><html><head> <meta charset="utf-8"><...
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<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> ...
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<!DOCTYPE html><html> <head> <meta charset="UTF-8"> <title>...
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<!DOCTYPE html> <html> <head> <meta charset=&...
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<!DOCTYPE html> <html> <head> <meta charset=&...
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<!DOCTYPE html> <html> <head> <meta charset=&...
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document.getElementById(id); 通过ID获取元素，不常用document.getElementsByName('login')通过Name属性获取元素docu...
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