用switch,哪里错了
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']]; for(var i=0;i<infos.length;i++){ var n = 0; var arr=[]; switch(infos[i][3]){ case "大一": arr[n]=infos[i][3]; break; default: document.write("<br>"); n++; }} for(var j=0;j <arr.length;j++){ switch(arr[j][1]){ case "女": document.write(arr[j][0]); break; default: document.write("<br>"); } }