1、登录微信公众平台，点击左侧开发者中心，记下AppId和AppSecret。
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2、在开发者中心页下面--开发工具里，点击进入“在线接口调试工具”。
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3、填写好第一步记下的appid和appsecret，然后点击最下端的检查问题。
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4、会出现以下提示，其中红色框里的就是想要的access_token。
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