传递内置参数，且扩展参数传递

    <div :id="'echartItem'+index" v-for="(item,index) in echartListAll" :key="index">
        <Page :current="item.excelSet.currentPage"
              @on-change="function(params){pageChange(params, index)}"
        />
    </div>

pageChange: function (val,index) {
        var _this = this;
        if (index) {
            _this.nowEchartNum = index;
        }
 },
    <di