摘要：
<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>Title</title></head><body> <input type="button" value="开始计时" onClick="start()"><in 阅读全文
摘要：
<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>Title</title></head><body> <input type="text" id="clock" style="width: 300px" /><i 阅读全文
摘要：
<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>Title</title></head><body> <input type="button" value="点我,等待一秒我弹出个窗口" onClick="set 阅读全文
摘要：
<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>Title</title></head><body><div id="div1" style="font-size: 50px;">我是一个段落</div> </b 阅读全文
摘要：
<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>Document</title> <style> select { width: 70px; height: 120px; } button { display: 阅读全文