HTML+CSS+JS模仿win10亮度调节效果

HTML+CSS+JS模仿win10亮度调节效果

代码

1.将各个元素的样子写出来

​ 这里为了方便好观察给body添加了一个背景颜色

• html

• css

  body{
      background:back;
  }
  .control_bar{
      height:200px;
      width:500px;
      border-bottom:3px solid #888888;
  }
  .control_bar_cursor{
      height:25px;
      width:8px;
      background: #505151;
      border-radius:5px;
  }
  

• 效果图

  

2. 将各个元素叠到一起

• css

  body{
      background:black;
  }
  .control_bar{
      height:200px;
      width:500px;
      border-bottom:3px solid #888888;
  
  }
  .control_bar_cursor{
      height:25px;
      width:8px;
      background: #505151;
      border-radius:5px;
      margin-top:-12.5px;
      position:relative;
      top:0;
      left:0;
  }
  .control_bar_cursor:hover{
      background:white;
  }
  #control_bar_mask{
      margin-top:-203px;
      width:100px;
  }
  

  这里为了显示遮罩效果把遮罩层的div宽度设小了

  

3. 添加js

• js

  window.onload = function(){
      var control_bar = document.getElementsByClassName("control_bar")[0];
      var control_bar_mask = document.getElementById("control_bar_mask");
      var control_bar_cursor = document.getElementsByClassName("control_bar_cursor")[0];
      var def_left = control_bar_cursor.offsetLeft;
      document.body.onmousedown = function(){
          window.onmousemove = function(){
              var cursor_X = event.clientX;
              var cursor_Y = event.clientY;
              if(cursor_X < def_left){
                  control_bar_cursor.style.left = 0;
              }else if(cursor_X > control_bar.offsetWidth + def_left){
                  control_bar_cursor.style.left = control_bar.offsetWidth;
              }else{
                  control_bar_cursor.style.left = cursor_X - def_left + "px";
              }
              var proportion = parseInt(control_bar_cursor.offsetLeft - def_left) / parseInt(control_bar.offsetWidth - 1);
              control_bar_mask.style.width = proportion * control_bar.offsetWidth + "px";
          };
          window.onmouseup = function(){
              window.onmousemove = null;
          };
      };
  };
  

  4. 添加一个mask用控制条来控制其透明度达到亮度调节效果

  .mask{
      position:fixed;
      bottom:0;
      top:0;
      left:0;
      right:0;
      background:black;
      z-index:-1;
  }
  

  window.onload = function(){
      var control_bar = document.getElementsByClassName("control_bar")[0];
      var control_bar_mask = document.getElementById("control_bar_mask");
      var control_bar_cursor = document.getElementsByClassName("control_bar_cursor")[0];
      var def_left = control_bar_cursor.offsetLeft;
      var mask = document.getElementsByClassName("mask")[0];
      document.body.onmousedown = function(){
          window.onmousemove = function(){
              var cursor_X = event.clientX;
              var cursor_Y = event.clientY;
              if(cursor_X < def_left){
                  control_bar_cursor.style.left = 0;
              }else if(cursor_X > control_bar.offsetWidth + def_left){
                  control_bar_cursor.style.left = control_bar.offsetWidth;
              }else{
                  control_bar_cursor.style.left = cursor_X - def_left + "px";
              }
              //亮度比
              var proportion = parseInt(control_bar_cursor.offsetLeft - def_left) / parseInt(control_bar.offsetWidth - 1);
              control_bar_mask.style.width = proportion * control_bar.offsetWidth + "px";
              mask.style.opacity = 1 - proportion;
          };
          window.onmouseup = function(){
              window.onmousemove = null;
          };
      };
  };