问如何用js onclick显示当前html页面？

EN

let previousContent = "";

function handleClick() {
  // Find the element that you want to change its content
  const pageLayout = document.getElementById("layout");

  // Check if there is any stored content
  if(previousContent) {
    pageLayout.innerHTML = previousContent;
    
    //Clear the stored content
    previousContent = "";

  } else {

    // Store the previous content
    previousContent = pageLayout.innerHTML;

    //Create the new content
    const newContent = " your new content";

    //Update the content
    pageLayout.innerHTML = newContent;

  }
}

const button = document.getElementById("my-button-id");
button.addEventListener("click", handleClick);