js实现可以点击收缩或张开的悬浮窗

 

    

      

        
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var menubox = document.getElementById("area"); //area为菜单栏的id
  var cli_on = document.getElementById("on"); //on为按钮
  var flag = false, timer = null, initime = null, r_len = 0;

  if(menubox.style.right=== 0){
    flag = true;
    }
  else{
    flag = false;
    }
  cli_on.Onclick= function () {
    //为on按钮绑定click事件
    clearTimeout(initime);
    //根据状态flag执开展开收缩
    if (flag) {
      r_len = 0;
      timer = setInterval(slideright, 10);
    } else {
      r_len = -160;
      timer = setInterval(slideleft, 10);
    }
  }
  //展开
  function slideright() {
    if (r_len <= -160) {
      clearInterval(timer);
      flag = !flag;
      return false;
    }else{
      r_len -= 5;
      menubox.style.right = r_len + 'px';
    }
  }
  //收缩
  function slideleft() {
    if (r_len >= 0) {
      clearInterval(timer);
      flag = !flag;
      return false;
    } else {
      r_len += 5;
      menubox.style.right = r_len + 'px';
    }
  } 

 

  

   

    
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