html,body {
    height: 100%;
    margin: 0;
    padding: 0;
  }
  * {
    box-sizing: border-box;
  }
  *::before,
  *::after {
    box-sizing: border-box;
  }
  a:focus,
  a:active {
    outline: none;
  }
  a,
  a:focus,
  a:hover {
    cursor: pointer;
    color: inherit;
    text-decoration: none;
  }
  
  h1,
  h2,
  h3,
  h4,
  h5,
  h6 {
    margin: 0;
    padding: 0;
  }
  *{   
    -webkit-touch-callout:none;  /*系统默认菜单被禁用*/   
    -webkit-user-select:none; /*webkit浏览器*/   
    -khtml-user-select:none; /*早期浏览器*/   
    -moz-user-select:none;/*火狐*/   
    -ms-user-select:none; /*ie10*/   
    user-select:none; 
  }  
  img{ pointer-events:none;}