我在加载页面时调用此函数:functionsetBeacon(){if(!navigator.sendBeacon){alert("Nonavigatorbeaconavailable.Thisisacriticalbugwhichmustbefixed.");}else{if('beforeunload'inwindow){$(window).on('beforeunload',function(){generateFormSendBeacon();returnundefined;});}elseif('onpagehide'inwindow){alert("onpagehide")