echarts点击事件中使用$emit得坑

echarts点击事件中使用$emit

	//执行点击事件
	let that = this;  //解决this指向问题 TypeError: this.$emit is not a function
    myChart.on('dblclick', function (params) {
		console.log(params)
	  that.$emit("titleChanged","1")
}		
);

	},

如果直接写that.$emit(“titleChanged”,“1”)会报错！巨坑