JS获取数组小技巧

有如下数组

var infoArray = strTest.split(";");
            var points2;
            for (var i = 0; i < infoArray.length; i++) {
                var info = infoArray[i];
                points2 = info + "," + points2;
            }
            points2 = points2.substring(0, points2.length - 10);
            var points3 = "[" + points2 + "]";

生成的数组JS获取报错，修改如下正常

var infoArray = strTest.split(";");
            var str = "", points;
            for (var i = 0; i < infoArray.length; i++) {
                str += "," + infoArray[i];
            }
            points = eval("[" + str.substr(1) + "]");