this.setState（）不是函数

Question

i want to change state when fetching data is success n the setState cannot to use because get error this.setState is not a function

enter image description here

Answer 1

这是一个范围问题，用这样的箭头函数替换函数回调：

apiServer.getBalance(myData.token, myData.id, response => {
  if (response.success) {
    console.log("Balance success");
    balance = response.success.balance;
    this.setState({ balance: response.success.balance });
  } else {
    //login failed
    console.log("failed");
  }
});

快乐的编码。