[CSSチュートリアル】Display, Visibility, Opacity, rgba, z-indexのcss。-1差分

<style>
    .d1{
      display: none;
    }
    .d2{
      visibility: visible;
    }
    .d3{
      opacity: 0;
    }
  </style>

  <div class="d1" onclick="clickEvent('display: none;')"></div>
  <div class="d2" onclick="clickEvent('visibility: hidden;')"></div>
  <div class="d3" onclick="clickEvent('ability: 0;')"></div>
  <script type="text/javascript">
    function clickEvent(type){
      alert(type)
    }
  </script>

// html
<div class="container">
    <div class="target">
        <p>I am target, and you ? </p>
    </div>
</div>


// css
  <style>
      .container{
          margin: 0 auto;
          width: 500px;
          min-height: 30px;
          background-color: skyblue;
      }
      .target{
          width: 200px;
          height: 50px;
          line-height: 50px;
          text-align: center;
          margin: 0 auto;
          background-color: plum;
          color: #fff;
          transition: all linear 1s;
          cursor: pointer;
      }
      .clickBlock{
        display: none;
      }
      .clickVisibility{
          visibility: hidden;
      }
      .clickOpacity{
          opacity: 0;
      }
      .clickRgba{
          background-color: rgba(221, 160, 221, 0);
      }
      .clickZindex{
          z-index: -1;
          position: absolute;
      }
  </style>

// js
    const _target = document.getElementsByClassName("target")[0];
    _target.onclick = (() => {
        let i = 1; // click number of times
        return () => {
        // _target.attributes.class.value += " clickBlock";
        // _target.attributes.class.value += " clickVisibility";
        // _target.attributes.class.value += " clickOpacity";
        // _target.attributes.class.value += " clickRgba";
        _target.attributes.class.value += " clickZindex";
        console.log(`${i}th click`);
        i++;
    }})();