<!DOCTYPE ?HTML><html ><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>系好安全帶,準(zhǔn)備啟航</title><script type="text/javascript">? //通過(guò)javascript的日期對(duì)象來(lái)得到當(dāng)前的日期，并輸出。? ?var date=new Date();? ?var year=date.getFullYear();? ?var month=date.getMonth();? ?var mon=month+1;? ?var day=date.getDate();? ?var week=date.getDay();? ?var weekend=["星期日","星期一","星期二","星期三","星期四","星期五","星期六"];? ?? ?document.write(year+"年"+mon+"月"+day+"日"+" "+weekend[week]+"--班級(jí)總分為:"+avg1);??????? //成績(jī)是一長(zhǎng)竄的字符串不好處理，找規(guī)律后分割放到數(shù)組里更好操作哦? var scoreStr = "小明:87;小花:81;小紅:97;小天:76;小張:74;小小:94;小西:90;小伍:76;小迪:64;小曼:76";?var score=scoreStr.spilt(";");? //從數(shù)組中將成績(jī)撮出來(lái)，然后求和取整，并輸出。? var sum=0;? for(var i=0;i<score.length;i++)? {? ? ? var num=score[i].indexOf(":")+1? ? ? sum=sum+parseInt(score[i].substr(num,2));? ? ??? }? var avg=parseInt(sum/score.length);? var avg1=Math.floor(avg);???</script></head><body></body></html>
第七章的編程題,為什么輸出平均分的時(shí)候會(huì)顯示undefined?
那一年_0001
2016-03-19 18:54:22
