漂亮实用的loading(加载)封装

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<!-- 缓冲提示条 -->
<div class='buffer hidden' id='buffer' >
    <div class="spinner">
      <span class='buffer_tip' id='buffer_tip' >正在登陆</span>
      <div class="rect1"></div>
      <div class="rect2"></div>
      <div class="rect3"></div>
      <div class="rect4"></div>
      <div class="rect5"></div>
    </div>
</div>
<!-- 缓冲提示条 -->

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/*缓冲提示条 start*/
.buffer{
    background-color: black;
    height: 120px;
    width: 60%;
    margin: auto;
    filter: alpha(Opacity=60);
    -moz-opacity: 0.6;
    opacity: 0.85;
    border-radius: 7px;
}

.buffer_tip{
  color: wheat;
  font-size: 20px;
  display: block;
  padding-top: 15px;
}

.spinner {
  margin: -190% auto;
  height: 60px;
  text-align: center;
  font-size: 10px;
}
 
.spinner > div {
  background-color: #67CF22;
  height: 100%;
  width: 6px;
  display: inline-block;
   
  -webkit-animation: stretchdelay 1.2s infinite ease-in-out;
  animation: stretchdelay 1.2s infinite ease-in-out;
}
 
.spinner .rect2 {
  -webkit-animation-delay: -1.1s;
  animation-delay: -1.1s;
}
 
.spinner .rect3 {
  -webkit-animation-delay: -1.0s;
  animation-delay: -1.0s;
}
 
.spinner .rect4 {
  -webkit-animation-delay: -0.9s;
  animation-delay: -0.9s;
}
 
.spinner .rect5 {
  -webkit-animation-delay: -0.8s;
  animation-delay: -0.8s;
}
 
@-webkit-keyframes stretchdelay {
  0%, 40%, 100% { -webkit-transform: scaleY(0.4) } 
  20% { -webkit-transform: scaleY(1.0) }
}
 
@keyframes stretchdelay {
  0%, 40%, 100% {
    transform: scaleY(0.4);
    -webkit-transform: scaleY(0.4);
  }  20% {
    transform: scaleY(1.0);
    -webkit-transform: scaleY(1.0);
  }
}

/*缓冲提示条 end*/

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/*缓冲进度条 start*/

/**
 * 显示loading(加载)动画
 * @param  {[type]} tip_text [提示的文字]
 * @return {[type]}          [description]
 */
function buffer_tip_show(tip_text){
  $("#buffer_tip").html(tip_text ? tip_text : '请稍等');
  $("#buffer").removeClass("hidden");
}

/**
 * 不显示loading(加载)动画
 * @return {[type]}          [description]
 */
function buffer_tip_hidden(){
  $("#buffer").addClass("hidden");
}

/*缓冲进度条 end*/

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// 显示
buffer_tip_show('正在努力加载中');
// 不显示
buffer_tip_hidden();