解决CSS样式冲突的几个办法(小结)

<div class="cellphones">
  <div class="apple"></div>
</div>
<div class="fruit">
  <div class="apple"></div>
</div>

/* 后代组合器：所有后代节点 */
.cellphones .apple {
 border: 1px solid black;
}

/* 更加精确的后代组合器 */
body .cellphones .apple {
  border: 1px solid blue;
}

/* 子代组合器：直接子节点 */
.cellphones > .apple {
  border: 1px solid red;
}

.cellphones > .apple.apple {
  border: 1px solid purple;
}
.cellphones > .apple {
  border: 1px solid red;
}

<div class="redBorder" class="blackBorder"></div>

.blackBorder {
  border: 1px solid black;
}
.redBorder {
  border: 1px solid red;
}

<div class="redBorder" class="greenBorder"></div>

.greenBorder {
  border: 1px solid green !important;
}
.redBorder {
  border: 1px solid red;
}