百度echarts处理legend事件点击

myChart.on('legendselectchanged', function(params) {
var name = params.name;
if(name == '全部'){
var selected = params.selected;
var flag = selected[name];

        var selectArr = myChart.getOption().legend[0].data;        var obj = {};        for(var key in selectArr){            obj[selectArr[key]] = flag;        }            option.legend.selected = obj;        myChart.setOption(option);        }});