背景：项目中有一个场景要监听android手机物理返回键，但是app和js的中间件又没提供这个事件的监听，只能百度纯js实现了
第一步：
xback.js
;!function(pkg, undefined){
var STATE = 'x-back';
var element;
var onPopState = function(event){
event.state === STATE && fire();
}
var record = function(state){
history.pushState(state, null, location.href);
}
var fire = function(){
var event = document.createEvent('Events');
event.initEvent(STATE, false, false);
element.dispatchEvent(event);
}
var listen = function(listener){
element.addEventListener(STATE, listener, false);
}
;!function(){
element = document.createElement('span');
window.addEventListener('popstate', onPopState);
this.listen = listen;
this.record = record(STATE);
record(STATE);
}.call(window[pkg] = window[pkg] || {});
}('XBack');
第二步：
加载xback.js文件
<remote-script src="../js/xback.js" @load="loadXBack"></remote-script>
自定义组件remote-script可以参考我另外的一篇文章：https:
第三步：
监听返回键事件
methods: {
// JavaScript监听手机物理返回键
loadXBack () {
window.XBack.listen(() => {
this.dialog = this.$createDialog({
type: 'confirm',
content: `确定返回吗？`,
confirmButton: {
text: '确定',
active: true,
disabled: false
},
cancelButton: {
text: '取消',
active: false,
disabled: false
},
onConfirm: () => {
this.dialog.hide()
this.close()
},
onCancel: () => {
this.dialog.hide()
window.history.pushState('x-back', null, window.location.href)
}
})
this.dialog.show()
})
},
}
