ajax加载时的进度条

#_loadMsg{
    display: inline-block;
    width: 100%;
    text-align: center;
    line-height: 45;
    padding-left: 20px;
    display : none;
}

#_loading_div {
     vertical-align: middle;
    display: inline-block;
    width: 100%;
    height: 100%;
    margin: 0 auto;
    text-align: center;
    position: absolute;
    z-index: 3;
    line-height: 40;
    opacity: 0.5;
    display : none;
    background: #CCCCCC;
}

#_loading_div span {
    display: inline-block;
    width: 10px;
    height: 40px;
    animation-name: scale;
    -webkit-animation-name: scale;
    -moz-animation-name: scale;
    -ms-animation-name: scale;
    -o-animation-name: scale;
    animation-duration: 1.2s;
    -webkit-animation-duration: 1.2s;
    -moz-animation-duration: 1.2s;
    -ms-animation-duration: 1.2s;
    -o-animation-duration: 1.2s;
    animation-iteration-count: infinite;
    -webkit-animation-iteration-count: infinite;
    -moz-animation-iteration-count: infinite;
    -ms-animation-iteration-count: infinite;
    -o-animation-iteration-count: infinite;
}
span.item-1 {
  background: #2ecc71;
}
span.item-2 {
  background: #3498db;
}
span.item-3 {
  background: #9b59b6;
}
span.item-4 {
  background: #e67e22;
}
span.item-5 {
  background: #c0392b;
}
span.item-6 {
  background: #e74c3c;
}
span.item-7 {
  background: #e74c8c;
}

.item-1 {
    animation-delay: -1s;
    -webkit-animation-delay: -1s;
    -moz-animation-delay: -1s;
    -ms-animation-delay: -1s;
    -o-animation-delay: -1s;
}

.item-2 {
    animation-delay: -0.9s;
    -webkit-animation-delay: -0.9s;
    -moz-animation-delay: -0.9s;
    -ms-animation-delay: -0.9s;
    -o-animation-delay: -0.9s;
}

.item-3 {
    animation-delay: -0.8s;
    -webkit-animation-delay: -0.8s;
    -moz-animation-delay: -0.8s;
    -ms-animation-delay: -0.8s;
    -o-animation-delay: -0.8s;
}

.item-4 {
    animation-delay: -0.7s;
    -webkit-animation-delay: -0.7s;
    -moz-animation-delay: -0.7s;
    -ms-animation-delay: -0.7s;
    -o-animation-delay: -0.7s;
}

.item-5 {
    animation-delay: -0.6s;
    -webkit-animation-delay: -0.6s;
    -moz-animation-delay: -0.6s;
    -ms-animation-delay: -0.6s;
    -o-animation-delay: -0.6s;
}

.item-6 {
    animation-delay: -0.5s;
    -webkit-animation-delay: -0.5s;
    -moz-animation-delay: -0.5s;
    -ms-animation-delay: -0.5s;
    -o-animation-delay: -0.5s;
}

.item-7 {
    animation-delay: -0.4s;
    -webkit-animation-delay: -0.4s;
    -moz-animation-delay: -0.4s;
    -ms-animation-delay: -0.4s;
    -o-animation-delay: -0.4s;
}

@-webkit-keyframes scale {
  0%, 40%, 100% {
    -moz-transform: scaleY(0.2);
    -ms-transform: scaleY(0.2);
    -o-transform: scaleY(0.2);
    -webkit-transform: scaleY(0.2);
    transform: scaleY(0.2);
  }

  20%, 60% {
    -moz-transform: scaleY(1);
    -ms-transform: scaleY(1);
    -o-transform: scaleY(1);
    -webkit-transform: scaleY(1);
    transform: scaleY(1);
  }
}
@-moz-keyframes scale {
  0%, 40%, 100% {
    -moz-transform: scaleY(0.2);
    -ms-transform: scaleY(0.2);
    -o-transform: scaleY(0.2);
    -webkit-transform: scaleY(0.2);
    transform: scaleY(0.2);
  }

  20%, 60% {
    -moz-transform: scaleY(1);
    -ms-transform: scaleY(1);
    -o-transform: scaleY(1);
    -webkit-transform: scaleY(1);
    transform: scaleY(1);
  }
}
@-ms-keyframes scale {
  0%, 40%, 100% {
    -moz-transform: scaleY(0.2);
    -ms-transform: scaleY(0.2);
    -o-transform: scaleY(0.2);
    -webkit-transform: scaleY(0.2);
    transform: scaleY(0.2);
  }

  20%, 60% {
    -moz-transform: scaleY(1);
    -ms-transform: scaleY(1);
    -o-transform: scaleY(1);
    -webkit-transform: scaleY(1);
    transform: scaleY(1);
  }
}
@keyframes scale {
  0%, 40%, 100% {
    -moz-transform: scaleY(0.2);
    -ms-transform: scaleY(0.2);
    -o-transform: scaleY(0.2);
    -webkit-transform: scaleY(0.2);
    transform: scaleY(0.2);
  }

  20%, 60% {
    -moz-transform: scaleY(1);
    -ms-transform: scaleY(1);
    -o-transform: scaleY(1);
    -webkit-transform: scaleY(1);
    transform: scaleY(1);
  }
}

var loading = {
        baosight : {
            showPageLoadingMsg : function(showMessage){
                if($("#_loading_div").length == 0){
                    $("body").append(‘<div id="_loading_div"><span class="item-1"></span><span class="item-2"></span><span class="item-3"></span><span class="item-4"></span><span class="item-5"></span><span class="item-6"></span><span class="item-7"></span></div>‘);
                }
                if($("#_loadMsg").length == 0){
                    $("body").append(‘<div id="_loadMsg">正在加载,请稍候... ...</div>‘);
                }
                if(showMessage == true || showMessage == "true" ){
                    $("#_loadMsg").show();
                }
                $("#_loading_div").show();
            },
            hidePageLoadingMsg :function() {
                $("#_loading_div").hide();
                $("#_loadMsg").hide();
            }
        }
}