javascript - 如何在 Chrome 扩展中比较变量与本地存储？

Question

下面是我在 Chrome 扩展程序中使用的代码，它从本地存储中获取 URL 并将其与网页的当前 URL 进行比较。

问题是 javascript 没有将它们显示为相等，即使它们是相同的..(下面 a=http://www.google.com 和 b=http://www.google.com)

var a="";
chrome.extension.sendRequest({method: "getLocalStorage", key: "url"}, function(response) {
a=response.data;
});
var b = document.location;

//I am trying to compare a and b but I always get they are equal even though they are one and the same

 if (a==b)
 {
   alert("Equal");
 }

Answer 1

需要等待响应回调函数。将代码更改为:

var a="";
chrome.extension.sendRequest({method: "getLocalStorage", key: "url"}, function(response) {
  a=response.data;
  var b = document.location;
   if (a==b)
   {
     alert("Equal");
   }
});