为什么我的函数返回“ undefined”

Question

I want to get a value from class Check but always get undefined .

class Check {
 static testget() {
    let tester = 1;
    return tester;
  }
}

window.onscroll = function() {
  const test = new Check();
  console.log(test.testget);
};

It should show 1 on console, but I always get undefined .

Answer 1

I will request you to spent some time on Classes: Static methods .

Since the member ( testget ) is static , you can not access that with an instance ( test ) of the class, use class name. Also specify () after function name to invoke the function:

console.log(Check.testget());