//初始化已选优惠券编码
var discountTbody=document.getElementById('discountTbody');
var discountRows=discountTbody.rows;
var selectCouponList=[];
console.log("初始化selectCouponList");
for(var i=0;i<discountRows.length;i++){//遍历行
    var cells=discountRows[i].cells;
    selectCouponList.push(cells[0].innerHTML);//添加列值
    console.log(cells[0].innerHTML)
    console.log(selectCouponList.indexOf(cells[0].innerHTML))
}