html,body,div,span,object,iframe,h1,h2,h3,h4,h5,h6,p,blockquote,pre,a,abbr,acronym,address,big,cite,code,del,dfn,em,img,ins,kbd,q,s,samp,small,strike,strong,sub,sup,tt,var,dl,dt,dd,ol,ul,li,fieldset,form,label,legend,table,caption,tbody,tfoot,thead,tr,th,td {
  margin: 0;
  padding: 0;
  border: 0;
  outline: 0;
}
:focus {
  outline: 0;
}
table {
  border-collapse: separate;
  border-spacing: 0;
}
caption, th, td {
  text-align: left;
  font-weight: normal;
}
a img, iframe {
  border: none;
}
ol, ul {
  list-style: none;
}
input,textarea,select,button {
  font-size: 100%;
  font-family: inherit;
}
select {
  margin: inherit;
}

/* Fixes incorrect placement of numbers in ol’s in IE6/7 */

ol {
  margin-left: 2em;
}

/* == clearfix == */

.clearfix::after {
  content: ".";
  display: block;
  height: 0;
  clear: both;
  visibility: hidden;
}
.clearfix {
  display: inline-block;
}
* html .clearfix {
  height: 1%;
}
.clearfix {
  display: block;
}

img 
{
    -webkit-touch-callout: none; 
  	-webkit-user-select: none;
  	-khtml-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    -o-user-select: none;
    user-select: none;
    /* 打开后，onclick 事件无效 */
    /* pointer-events: none;  */
}