Update 123.md

增加首页上一讲下一讲
yhy949 · Apr 25, 2015 · 1daec5f · 1daec5f
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@@ -255,3 +255,7 @@ set.remove(obj)中的obj,必须是set中的元素,否则就报错.试一试:
 不管是否明白,貌似很厉害呀.
 
 是的,所以本讲仅仅是对集合有一个入门.关于集合的更多操作如运算/比较等,还没有涉及呢.
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+<hr>
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+[首页](./index.md)&nbsp;&nbsp;&nbsp;|&nbsp;&nbsp;&nbsp;[上一讲](./122.md)&nbsp;&nbsp;&nbsp;|&nbsp;&nbsp;&nbsp;[下一讲](./124.md)