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+ I Parent element selector: ul > li Wildcard selector: * Pseudo-class and pseudo-elements: a:hover, you should remember that the browser processing selector is right-to-left, which is why the rightmost selector is faster-#id或. class. div * {...}//Bad . List Li {...}//Bad . List-item {...}//Good #list. List-item {...}//Good In your script, try to reduce the DOM's operation as much as possible. Cache everything, including attributes and obj

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