When echarts has multiple polylines, one is displayed by default

Requirement: There are currently 4 polylines, and only two polylines are displayed by default.

After reading the documentation of echarts, the selected of the legend attribute can be controlled

legend: {
    
    
		orient: "vertical",
		show: _this.legendShow,
		top: 120,
		right: -10,
		textStyle: {
    
    
			color: "rgba(255, 255, 255, 0.7)",
		},
		data: ["订单量", "交货量", "发货量(过账)", "缺货量"],
		selected: {
    
     //在这里设置就ok了
			'订单量': true,
			'交货量': false,
			'发货量(过账)':true,
			'缺货量':false
		}
	},

result: