File list (Check if you may need any files):
练习1：location和history对象\autumn.html
............................\images\1.jpg
............................\......\2.jpg
............................\......\3.jpg
............................\......\4.jpg
............................\......\autumn.jpg
............................\......\spring.jpg
............................\......\summer.jpg
............................\......\winter.jpg
............................\index.html
............................\spring.html
............................\summer.html
............................\winter.html
............................\images
练习1：location和history对象
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