<!DOCTYPE html> <html> <head> <meta charset="utf-8"> &...
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<input type="text" name="username" placeholder="请输入用户名"><inpu...
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<!DOCTYPE html> <html> <head> <meta charset="utf-8"> &...
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<!DOCTYPE html> <html> <head> <title>微博输入</title> </head> ...
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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> <title>微博输入</title> </head> ...
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<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <...
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<!DOCTYPE html> <html> <head> <title>Date日期操作方法</title> </hea...
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<!DOCTYPE html> <html> <head> <title>全选</title> <style ...
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<!DOCTYPE html> <html> <head> <title>changeDIV</title> <styl...
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新知识点（1）使用text.value.length获取文本框字数，其中text.value可以返回字符串。（2）使用label.innerHTML = m将变量m的值输出至label标签之间。（3）...
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<!DOCTYPE html> <htnl> <head> ...
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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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