javascript之求最值

求最值:

    var selections = $("#deliveryGridSalesOrGoods").datagrid('getRows');
        var costPrice = '';
        var ecPrice='';
        if (selections != null && selections != '') {
            for (var i = 0; i < selections.length; i++) {
                costPrice += selections[i].ecPrice-selections[i].costPrice+',';
            }
        }
        if(costPrice!=null){
            costPrice = costPrice.substring(0, costPrice.lastIndexOf(","));
        }
        if (selections != null && selections != '') {
            for (var i = 0; i < selections.length; i++) {
                ecPrice += selections[i].ecPrice+',';
            }
        }
        if(ecPrice!=null){
            ecPrice = ecPrice.substring(0, ecPrice.lastIndexOf(","));
        }
        
        
        
      var arry = new Array();
      var newEc=costPrice.split(',');
      var newecPrice=ecPrice.split(',');
//      Number(value).toFixed(2);
      var ecmin=Math.min.apply(null, newEc).toFixed(2);;//最小值
      var ec_price=Math.min.apply(null, newecPrice).toFixed(2);;//最小值