什么是超级链接：
1通过超级连接建立链接的关系——>从一个页面跳转另一个页面——>a标签是成对出现的——<a></a>有开始有结束——>a标签不加属性：
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<html lang="en">
<head><meta charset="UTF-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta http-equiv="X-UA-Compatible" content="ie=edge"><title>超级链接</title>
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<body><a>超级链接</a>
</body>
</html>
只显示“超级链接”2.为了实现超链接功能：
1.href属性——>填入网页地址或文件地址；
<!DOCTYPE html>
<html lang="en">
<head><meta charset="UTF-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta http-equiv="X-UA-Compatible" content="ie=edge"><title>超级链接</title>
</head>
<body><a href="https://www.mi.com/seckill/">超级链接</a>
</body>
</html>
2.点击超级链接直接在当前页面,跳转到"指定的网页"——>在新的标签打开"指定的网页"——>
target属性——>后面什么都不写页面默认替换——>target="_blank"——>在网页里新开一个标签：
<!DOCTYPE html>
<html lang="en">
<head><meta charset="UTF-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta http-equiv="X-UA-Compatible" content="ie=edge"><title>超级链接</title>
</head>
<body><a href="https://www.mi.com/seckill/" target="_blank">超级链接</a>
</body>
</html>
3.在<a>可以放文字,还可以放图片</a>：
<!DOCTYPE html>
<html lang="en">
<head><meta charset="UTF-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta http-equiv="X-UA-Compatible" content="ie=edge"><title>超级链接</title>
</head>
<body><a href="https://www.mi.com/seckill/" target="_blank"><img src="bh1.png" alt=""></a>
</body>
</html>3.a标签还有很重要"书签标记"也叫"锚点"：
1.在html页面加行快捷写法——>br{$}*100——>br{$}*100+回车键：
<!DOCTYPE html>
<html lang="en">
<head><meta charset="UTF-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta http-equiv="X-UA-Compatible" content="ie=edge"><title>超级链接</title>
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<body><a href="https://www.mi.com/seckill/" target="_blank"><img src="bh1.png" alt=""> </a><br>1<br>2<br>3<br>4<br>5<br>6<br>7<br>8<br>9<br>10<br>11<br>12<br>13<br>14<br>15<br>16<br>17<br>18<br>19<br>20<br>21<br>22<br>23<br>24<br>25<br>26<br>27<br>28<br>29<br>30<br>31<br>32<br>33<br>34<br>35<br>36<br>37<br>38<br>39<br>40<br>41<br>42<br>43<br>44<br>45<br>46<br>47<br>48<br>49<br>50<br>51<br>52<br>53<br>54<br>55<br>56<br>57<br>58<br>59<br>60<br>61<br>62<br>63<br>64<br>65<br>66<br>67<br>68<br>69<br>70<br>71<br>72<br>73<br>74<br>75<br>76<br>77<br>78<br>79<br>80<br>81<br>82<br>83<br>84<br>85<br>86<br>87<br>88<br>89<br>90<br>91<br>92<br>93<br>94<br>95<br>96<br>97<br>98<br>99<br>100
</body>
</html>2.怎么加锚点——> <a href="#后面加行数"></a> ——>是通过"#"和"id"对应起——>就是重a链接调到"#后面加行数"里面去
<!DOCTYPE html>
<html lang="en">
<head><meta charset="UTF-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta http-equiv="X-UA-Compatible" content="ie=edge"><title>超级链接</title>
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<body><a href="https://www.mi.com/seckill/" target="_blank"><img src="bh1.png" alt=""> </a><a href="#end">最下面</a><br>1<br>2<br>3<br>4<br>5<br>6<br>7<br>8<br>9<br>10<br>11<br>12<br>13<br>14<br>15<br>16<br>17<br>18<br>19<br>20<br>21<br>22<br>23<br>24<br>25<br>26<br>27<br>28<br>29<br>30<br>31<br>32<br>33<br>34<br>35<br>36<br id="mid37">37<br>38<br>39<br>40<br>41<br>42<br>43<br>44<br>45<br>46<br>47<br>48<br>49<br>50<br>51<br>52<br>53<br>54<br>55<br>56<br>57<br>58<br>59<br>60<br>61<br>62<br>63<br>64<br>65<br>66<br>67<br>68<br>69<br>70<br>71<br>72<br>73<br>74<br>75<br>76<br>77<br>78<br>79<br>80<br>81<br>82<br>83<br>84<br>85<br>86<br>87<br>88<br>89<br>90<br>91<br>92<br>93<br>94<br>95<br>96<br>97<br>98<br>99<br id="end">100<a href="#mid37">mid37</a>
</body>
</html>
3.如果只写#——>例如：<a href="#">最顶上</a>
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100 mid37
