After following, you can keep track of his dynamic information in a timely manner
Courses in the relevant section：Name attribute and tag name shortcut to get elements
通過(guò)數(shù)組下標(biāo)（0）或者[0]來(lái)選標(biāo)簽的話。難道下面的標(biāo)簽要去數(shù)第幾個(gè)嗎？
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Courses in the relevant section：Click to jump to the corresponding main operation page
設(shè)置左邊菜單整體高度不是很懂一些單詞的意思和使用方法。 設(shè)置iframe獲取菜單頁(yè)面地址的方法是完全沒(méi)搞懂！
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