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如何将数据从Web存储到Firestore

我为用户创建了一个注册页面，当用户单击注册按钮时，我想将输入的注册详细信息存储到FireStore。它没有显示任何错误，但是数据没有存储在Firestore中。我的JavaScript文件是：

var config = {
    apiKey: "AIzaSyAJsAstiMsrB2QGJyoqiTELw0vsWFVVahw",
    authDomain: "websignin-79fec.firebaseapp.com",
    databaseURL: "https://websignin-79fec.firebaseio.com",
    projectId: "websignin-79fec",
    storageBucket: "",
    messagingSenderId: "480214472501"
  };
   firebase.initializeApp(config);
   var db=firebase.firestore();
  const inputTextfield = document.querySelector("#firstname").value;// it takes the values from signup page.
  const lastname = document.querySelector("#lastname").value;
  const email = document.querySelector("#email").value;
  const phonenumber = document.querySelector("#phone").value;
  //const savebutton=document.querySelector("#submit");
  console.log(inputTextfield);
  const save=document.querySelector("#submit");
  save.addEventListener("click",function() {
      db.collection("deyaPayusers").add({
                Name:inputTextfield,
                Email:email,
                PhoneNo:phonenumber,
                laseName:lastname,


      }).then(function() {

      console.log("Document successfully wriiten!");

})
.catch(function(error) {
    // The document probably doesn't exist.
    console.error("Error writing document: ", error);
});
});

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我的注册页面是：