dom操作相关，byebye T T

o = {

    name: 'aa',

    price: 11,

}

function add(items) {

    var bodys = document.getElementsByTagName('tbody');

    var trs = document.getElementsByTagName('tr');

    var trLen = trs.length;

    var str = `

        <td>${items['name']}</td>

        <td>${items['price']}</td>

        <td><a href="javascript:void(0);">删除</a></td>`

        var tr2 = document.createElement("tr");

        tr2.innerHTML = str;

        bodys[bodys.length - 1].appendChild(tr2);

        var sum = 0;

        for (var i = 1; i < trs.length - 1; i++) {

            var tds = trs[i].getElementsByTagName('td');

            // print(tds[1].innerText)

            sum +=  parseFloat(tds[1].innerText)

        }

        var foot = document.getElementsByTagName('tfoot')[0];

        var all = foot.getElementsByTagName('td')[0].innerText;

        var rows = trs.length;

        var result = `${sum.toFixed(2)}(${rows - 2}件商品)`;

        foot.getElementsByTagName('td')[0].innerText = result;

}

function bind() {

    var bodys = document.getElementById("jsTrolley");

    var trs = bodys.getElementsByTagName("tr");

    //给tr绑定click事件

    for(var i in trs){

      trs[i].onclick = function(e) {

        trs[this.rowIndex].parentNode.removeChild(trs[this.rowIndex]);

        var sum = 0;

        for (var i = 1; i < trs.length - 1; i++) {

            var tds = trs[i].getElementsByTagName('td');

            // print(tds[1].innerText)

            sum +=  parseFloat(tds[1].innerText)

        }

        var foot = document.getElementsByTagName('tfoot')[0];

        var all = foot.getElementsByTagName('td')[0].innerText;

        var rows = trs.length;

        var result = `${sum.toFixed(2)}(${rows - 2}件商品)`

        // print(result)

        foot.getElementsByTagName('td')[0].innerText = result;

      };

    }

}