JavaScript函数没有consol.log（var），但没有'；t var2=var

我遵循本教程：并将其实现到VueJS

在创建的钩子上，我运行以下函数：

register() {
      if ("serviceWorker" in navigator && "PushManager" in window) {
        console.log("Service Worker and Push is supported");

        navigator.serviceWorker
          .register("/sw.js")
          .then(function (swReg) {
            console.log("Service Worker is registered", swReg);
            swRegistration = swReg;
          })
          .catch(function (error) {
            console.error("Service Worker Error", error);
          });
      } else {
        console.warn("Push messaging is not supported");
        pushButton.textContent = "Push Not Supported";
      }
    }

Chrome、Safari和Firefox中的我的控制台打印：

"Service Worker and Push is supported"
"Service Worker is registered >ServiceWorkerRegistration"
"Service Worker Error ReferenceError: swRegistration is not defined"

有人知道为什么可以记录swReg，但不能分配swReg吗

.then(function (swReg) {
                console.log("Service Worker is registered", swReg);
                swRegistration = swReg;

---

可能是因为未定义

swRegistration

？尝试在代码段顶部添加

让swRegistration

，一切都会好起来的。

---

享受。

可能是因为

swRegistration

没有定义？尝试在代码段顶部添加

让swRegistration

，一切都会好起来的。

---

享受吧。

你应该先申报注册，你不会面临同样的问题 swReg问题，因为这是注册承诺的结果

register() {
      let swRegistration = null;
      if ("serviceWorker" in navigator && "PushManager" in window) {
        console.log("Service Worker and Push is supported");

        navigator.serviceWorker
          .register("/sw.js")
          .then(function (swReg) {
            console.log("Service Worker is registered", swReg);
            swRegistration = swReg;
          })
          .catch(function (error) {
            console.error("Service Worker Error", error);
          });
      } else {
        console.warn("Push messaging is not supported");
        pushButton.textContent = "Push Not Supported";
      }
    }

---

你应该先申报注册，你不会面临同样的问题 swReg问题，因为这是注册承诺的结果

register() {
      let swRegistration = null;
      if ("serviceWorker" in navigator && "PushManager" in window) {
        console.log("Service Worker and Push is supported");

        navigator.serviceWorker
          .register("/sw.js")
          .then(function (swReg) {
            console.log("Service Worker is registered", swReg);
            swRegistration = swReg;
          })
          .catch(function (error) {
            console.error("Service Worker Error", error);
          });
      } else {
        console.warn("Push messaging is not supported");
        pushButton.textContent = "Push Not Supported";
      }
    }

---

严格模式javascript错误。严格模式javascript错误。