問題：為什么onclick事件能正確獲取到我點的是數組哪個元素，還有下標。（tab，tabPos）for循環至setTabHandler(tab,i)，執行函數循環調用3次該函數，它不是直接循環完了嗎？這段javascript代碼應該不是從我點擊開始onclick事件才執行的吧？Tabbedinfoboxhtml{font-family:sans-serif;}*{box-sizing:border-box;}body{margin:0;}.info-box{border:1pxsolidred;width:452px;height:400px;margin:0auto;}.info-boxul{padding-left:0;margin-top:0;}.info-boxli{float:left;list-style-type:none;width:150px;}.info-boxlia{border:1pxsolidblack;display:block;text-decoration:none;width:100%;line-height:3;background-color:red;color:black;text-align:center;}.info-boxlia:focus,.info-boxlia:hover{background-color:#a60000;color:white;}.info-boxlia.active{background-color:#a60000;color:white;}.info-boxlia.demo{background-color:#030303;color:white;}.info-box.panels{position:relative;height:352px;clear:both;}.info-boxarticle{position:absolute;top:0;left:0;height:352px;padding:10px;color:white;background-color:#a60000;}.info-box.active-panel{z-index:1;}Tab1Tab2Tab3Thefirsttab1Loremipsumdolorsitamet,ThesecondtabThistabhasn'tgotanyLoremIpsuminit.Butthecontentisn'tveryexcitingallthesame.Thethirdtab3Loremipsumdolorsitduinequeeleifendlorem,aauctorliberoturpisatsem.Aliquamutporttitorurna.Nullafacilisivartabs=document.querySelectorAll('.info-boxlia');varpanels=document.querySelectorAll('.info-boxarticle');for(i=0;i