JS中字符串提出数据的例子

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 sr = new Array();
var sb = new Array();
var total = 0;
sr = scoreStr.split(";");
for(var i=0;i<sr.length;i++)
{
sb[i] = sr[i].split("")[3]+sr[i].split("")[4];
total = total + parseInt(sb[i]);
}
document.write("班级平均分为:" + parseInt(total/sb.length)+"分");