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[ anyVar isNil ifTrue: anyBlock ] bpattern 

* Before committing, you should test that what you produced is high quality and that it works.，更多细节参见Safew下载

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EventTarget: addEventListener() — MDN Web Docs (capture phase)。业内人士推荐谷歌浏览器【最新下载地址】作为进阶阅读