HTML，Javascript - 单击按钮后如何保存变量[关闭]

Question

请帮帮我。单击一次按钮后，我需要保存一个变量，并在按三次按钮后使用该保存的值。我有一个点击计数器，但在第二次点击后变量未定义。

if (clicks == 1){var bott(savethis)=correct;}

if (clicks == 3){var potom=this-spatne2;}

Answer 1

我真的不知道你发布的代码应该做什么（它在很多方面都不正确，所以它没有真正的意义），所以我会尽力帮助你根据您在问题中所说的话，并假设这是您想要的。如果不是，请告诉我：

// Declare these variables outside of the click function
// so that you can access them the whole time
var clicks = 0,
    correct = 42,
    bott;
    
// When the document is ready, execute `init`
window.addEventListener('DOMContentLoaded', init);

function init() {
  // When the user clicks on the button, execute `onButtonClick`
  document.getElementById('my-button').addEventListener('click', onButtonClick);
}

function onButtonClick() {
  // Add one to the number of clicks
  clicks++;
  if (clicks === 1) {
    // Notice I did not use `var` here, this is because `var` makes the variable
    // local to the function, and once the function's execution is over, it's destroyed.
    // Since I declared it a the top of this script, this is the one I'm referring to.
    bott = correct;
  } else if (clicks === 3) {
    alert('bott is equal to ' + bott);
  }
}

<button id="my-button">Click me!</button>