根據實際框架吧，這里用了backbone，否則可以根據實際情況用 window.history.length 或者 history.length
let len = Backbone.history.history.length;
if (+length === 1) {
let data = { function: 'closePage'};
window.WebViewJavascriptBridge.send(JSON.stringify(data), function(responseData) {
})
}else {
Backbone.history.history.back();
}
