1、在pages.json配置导航栏 autoBackButton 属性

            "path" : "pages/login",
            "style" : {
				"navigationBarTitleText": "登录",
				"app-plus": {
					"titleNView": {
						"autoBackButton": false
					}
				}
			}

2、在pages/login页 mounted 钩子里加上如下代码段

var a = document.getElementsByClassName('uni-page-head-hd')[0]
a.style.display = 'none';