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<!DOCTYLE html><html><head><meta charset="utf-8"><title>那就做個...
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一、實現(xiàn)功能當鼠標在導航條上移動時，下劃線跟著移動，背景色和字體顏色改變，鼠標移出導航條時，下劃線回到原位。二、功能代碼<!DOCTYPE html> <html ...
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