解决办法
在page.json文件下将 globalStyle 下的 navigationStyle 设置为 “custom” 即可解决微信H5双标题的问题

	"globalStyle": {
		"navigationStyle":"custom",设置成 custom 即可解决微信H5双标题的问题
		"navigationBarTextStyle": "black",
		"navigationBarTitleText": "uni-app",
		"navigationBarBackgroundColor": "#F8F8F8",
		"backgroundColor": "#F8F8F8",
		"app-plus": {
			"background": "#efeff4"
		}
	}