js 監聽手機端返回鍵的動作

$(document).ready(function () {
    window.history.pushState("", "", "#");
});
window.addEventListener("popstate", function (e) {
    // alert(1)
    // alert(window.history.length);
    if( window.history.length == 2){
        window.location.href = "/";
    }else{
        window.history.go(-1);
    }
    
})