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for(i=0;i<arr.length;i++){ document.write(arr[i]+'<br/>'); }

最后打印出數組為什么是document.write(arr[i]）而不是document.write(arr）
arr[i]表示什么意思？

qq_iDIotlive_14401682

2016-12-01

源自：JavaScript進階篇 3-8

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xuyingxuying 回答被采納 +3 積分
2016-12-01

你要是打印arr的話，會循壞出n次arr數組的

0 回復有任何疑惑可以回復我~

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qq_崔俊_0
2016-12-01

//數據源
var?infos=[["小A","女",21,"大一"],["小B","男",23,"大三"],["小C","男",24,"大四"],["小D","女",21,"大一"],["小E","女",22,"大四"],["小F","男",21,"大一"],["小G","女",22,"大二"],["小H","女",20,"大三"],["小I","女",20,"大一"],["小J","男",20,"大三"]];
//定義空數組接數據
var?arr?=?[];
for(var?i=0;i<infos.length;i++){
????//用if過濾
????if(infos[i][3]?==?'大一'){
????????arr.push(infos[i]);
????}
}
document.write(arr);

你的意思是不是這樣？