Uncaught TypeError: Cannot read property 'getTime' of undefined

var end = arg.data.get("endDate");
var startDate = arg.data.get("togDate");
if(end == "" || end == null){
var nowDate = new Date();
var s1 = startDate.getTime();
var s2 = nowDate.getTime();
var total = (s2 - s1)/1000;
var day = parseInt(total / (24*60*60));
arg.dom.innerHTML=day+1
return false;
}
运行时F12报的错Uncaught TypeError: Cannot read property 'getTime' of undefined

回答和翻译如下：
Uncaught TypeError: Cannot read property 'getTime' of undefined 10
var end = arg.data.get("endDate"); var startDate = arg.data.get("togDate"); if(end == "" || end == null){ var nowDate = new Date(); var s1 = startDate.getTime(); var s2 = nowDate.getTime(); var total = (s2 - s1)/1000; var day = ... var end = arg.data.get("endDate");
var startDate = arg.data.get("togDate");
if(end == "" || end == null){
var nowDate = new Date();
var s1 = startDate.getTime();
var s2 = nowDate.getTime();
var total = (s2 - s1)/1000;
var day = parseInt(total / (24*60*60));
arg.dom.innerHTML=day+1
return false;
}
运行时F12报的错Uncaught TypeError: Cannot read property 'getTime' of undefined
Uncaught TypeError：无法读取定义的10属性“时间” var = arg的数据得到（“结束日期”）； VaR StartDate = arg的数据得到（“togdate”）； 如果（= =“| |结束= = null）{ 无功nowdate =新（）； VaR gettime() S1 =日期； VaR nowdate gettime() S2 =； var =（S2 - S1）/ 1000； var = parseInt（总数/（24×60×60））； 精氨酸。DOM .innerHTML = 1天 返回false； } 运行时F12报的错捕获列表无法读取定义的属性“时间”