//饼图//dot 圆点//r 半径//data 数据（一维数组）function drawPie(dot, r, data){    if(data && data.length > 0){        var accumulationAngleOfSlope = new Number(0); //累计偏移角度        var total = new Number(0);        var i = 0;        for(;i<data.length;i++){ //计算data的合计            total += data[i];        }        for(i = 0;i<data.length;i++){            var angle = new Number(360*data[i]/total).toFixed(3); //将data[i]/total转换为角度            //画一个扇形            drawSector(dot, r, new Number(angle), new Number(accumulationAngleOfSlope), true, Number(parseFloat(data[i]/total)*100).toFixed(3)+‘%‘);            accumulationAngleOfSlope = accumulationAngleOfSlope+parseFloat(angle); //累计偏移角度        }    }}