javascript - 简单的 Javascript 代码 - 切换功能 - 请解释

Question

有人可以解释一下这个 javascript 吗？也许对每一行都给出注释来解释它是如何工作的？

它工作得很好我只是想知道它是如何工作的。

谢谢

function toggleMe(a){
  var e =document.getElementById(a); 
  if(!e)return true;   
  if(e.style.display=="none"){ 
    e.style.display="block"
  } else {
    e.style.display="none"
  }
  return true;
}

Answer 1

function toggleMe(a)
{
    // Get the element from the DOM with the id as specified by the variable a
    var e =document.getElementById(a); 

    // if the element does not exist in the DOM then return true
    if(!e) 
        return true;

    // If the element is not being displayed (as specified by the css attribute 'display') then show it by setting the value to 'block' otherwise hide the element by setting the value to none.
    if(e.style.display=="none")
    {
        e.style.display="block"
    }
    else
    {
        e.style.display="none"
    }

    // If all goes well and the element is found and displayed or hidden then return true.
    return true;
}