Javascript 如何解决“cannot call method ... of undefined”错误？
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时间：2020-08-24 00:28:13 来源:igfitidea点击:
How to solve “cannot call method … of undefined” error?
提问by kamal
function calcRoute() {
var start = document.getElementById("start_").value;
var end = document.getElementById("end_").value;
var request = {
origin: start,
destination: end,
travelMode: google.maps.TravelMode.DRIVING
};
directionsService.route(request, function (response, status) {
if (status == google.maps.DirectionsStatus.OK) {
directionsDisplay.setDirections(response);
}
});
}
Gives an error message in Chrome: "Uncaught TypeError: Cannot call method 'setDirections' of undefined". Could anyone suggest fixing this? thanx
在 Chrome 中给出错误消息：“未捕获的类型错误：无法调用未定义的方法 'setDirections'”。有人可以建议解决这个问题吗？谢谢
采纳答案by The Alpha
You are missing (global var)
你不见了（全局变量）
//var directionsService = new google.maps.DirectionsService();
var directionsDisplay = new google.maps.DirectionsRenderer({ 'map': map });
So directionsDisplayis undefined.
所以directionsDisplay是未定义的。
