uniapp的webview实现左滑返回上一个页面操作方法

<template>
	<view>
		<web-view :src="weburl" :update-title="false" :webview-styles="webviewStyles">
		</web-view>
	</view>
</template>
<script>
	export default {
		data() {
			return {
				// 进度条
				webviewStyles: {
					progress: {
						color: '#FF3333'
					}
				},
				weburl: ""
			};
		},
		onLoad(option) {
			console.log("接收到的url参数是:", option.weburl); //打印出上个页面传递的参数。
			this.weburl = option.weburl
		},
		onReady() {
			var pages = getCurrentPages();
			var page = pages[pages.length - 1];
			var currentWebview = page.$getAppWebview();
			var url = currentWebview.children()[0].getURL();
			console.log('=== url ===', url);
			var wv = currentWebview.children()[0];
			wv.overrideUrlLoading({
				mode: 'reject',
				match: '.*'
			}, function(e) {
				console.log('reject url: ' + e.url);
				uni.navigateTo({
					url: `/pages/webbox/webbox?weburl=${e.url}`
				})
			});
		},
		onBackPress(e) {
			let pages = getCurrentPages()
			let page = pages[pages.length - 1];
			let currentPages = page.$getAppWebview()
			currentPages.close()
			return false
		},
		onNavigationBarButtonTap() {
			console.log("点击了标题栏按钮")
			uni.$emit("showMenu")
		},
		methods: {}
	}
</script>
<style lang="scss">
</style>

<script>
const facebook = uni.requireNativePlugin('sn-facebook');
var wv; //计划创建的webview
export default {
    data() {
        return {
            canBack: false
        };
    },
    onLoad() {},
    onBackPress() {
        if (wv && this.canBack) {
            wv.back();
            return true;
        }
        return false;
    },
    onReady() {
        // #ifdef APP-PLUS
        var self = this;
        var currentWebview = this.$scope.$getAppWebview(); //此对象相当于html5plus里的plus.webview.currentWebview()。在uni-app里vue页面直接使用plus.webview.currentWebview()无效，非v3编译模式使用this.$mp.page.$getAppWebview()
        setTimeout(function() {
            wv = currentWebview.children()[0];
            wv.addEventListener(
                'progressChanged',
                function(e) {
                    wv.canBack(function(e) {
                        self.canBack = e.canBack;
                    });
                },
                false
            );
        }, 500); //如果是页面初始化调用时，需要延时一下
        // #endif
    },
    methods: {
        onMessage({ detail }) {
            const data = detail.data[0];
            console.log('onMessage', data);
            if (data.action == 'login') {
                // 登录：自定义参数
                facebook.loginWithParams(
                    {
                        permissions: [
                            // 权限，更多权限请看 https://developers.facebook.com/docs/permissions/reference
                            'email',
                            'public_profile'
                        ],
                        // 返回字段，更多字段请查看 https://developers.facebook.com/docs/graph-api/reference/user/
                        fields: 'id, name, email'
                    },
                    e => {
                        console.log(e);
                        this.postMessage({ ...e, action: 'loginCallback' });
                    }
                );
            }
        },
        // postMessage to web
        postMessage(data) {
            if (wv) {
                wv.evalJS('window.postMessage(' + JSON.stringify(data) + ');');
            } else {
                uni.showToast({
                    icon: 'none',
                    title: 'webview不存在'
                });
            }
        }
    }
};
</script>