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loadingshow: function (msg) {
if (!msg) {
msg = "加载中...";
}
var jContext = $('body');
var jLoad = $("#appLoading");
var msgDIV = new Array();
msgDIV.push('<div id="appLoading" style="position:fixed;width:100%;height:100%; font-size:18px;background:rgba(0,0,0,0.5);top:0;left:0;z-index:555555">');
msgDIV.push("<div id='lContext'><img src='/App_Themes/Default/images/ajax-loader.gif' style='vertical-align:middle' /><span id='sInfo' style='margin-left:8px;display:inline-block'>" + msg + "</span>");
msgDIV.push('</div></div>');
jLoad = $(msgDIV.join('')).appendTo(jContext);
var left = jContext.width() / 2 - jLoad.find('#sInfo').width() / 2 - 20;
var top = jContext.height() / 2 - jLoad.find('#sInfo').height() / 2;
jLoad.find("#lContext").css({ position: 'fixed', top: top, left: left, color: 'white', padding: '10px', margin: '10px'});
$("#appLoading").show();//有问题请删除
},