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var score = new Array();在下面代码中有何用？怎么感觉没有作用？

var scoreStr = "小明:87;小花:81;小红:97;小天:76;小张:74;小小:94;小西:90;小伍:76;小迪:64;小曼:76";

var sourceArr = sorceStr.split(";");

//document.write(sourceArr);//test

//从数组中将成绩撮出来，然后求和取整，并输出。

var score = new Array();

var sum = 0;

for (var i = 0; i < sourceArr.length; i ++) {

sum += parseInt(sourceArr[i].substr(sourceArr[i].indexOf(":")+1));

//document.write("<br>" + sum);//test

}

document.write("--班级总分为:" + sum);

慕哥0503841

2019-08-12

源自：JavaScript进阶篇 7-23

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1frgdhf
2019-08-13

var score = "小明:87;小花:81;小红:97;小天:76;小张:74;小小:94;小西:90;小伍:76;小迪:64;小曼:76";
var avg=0;
var scoreSpli=score.split(";");
for(var i=0;i<scoreSpli.length;i++){

avg+=parseInt(scoreSpli[i].substr(-2)) ;

}
var pingjun=avg/scoreSpli.length

var mydate= new Date();
var Year=mydate.getFullYear();
var Month=mydate.getMonth()+1;
var day=mydate.getDate();
var ri=mydate.getDay();

var xiqi=["星期日","星期一","星期二","星期三","星期四","星期五","星期六"];

bb=xiqi[ri];

document.write( Year+ "年" + Month + "月" + day + "日" + bb + " "+ " 班级总分为：" + pingjun)