src/layui.js
function onCallback(){
      exports.push(layui[item]);
      apps.length > 1 ?
        that.use(apps.slice(1), callback, exports)
      : ( typeof callback === 'function' && callback.apply(layui, exports) );
    }
function onCallback(){
      exports.push(layui[item]);
      apps.length > 1 ?
        that.use(apps.slice(1), callback, exports)
      : ( typeof callback === 'function' && callback.apply(layui, exports) );
    }
function onCallback ( ) { exports . push ( layui [ item ] ) ; apps . length > 1 ? that . use ( apps . slice ( 1 ) , callback , exports ) : ( typeof callback === 'function' && callback . apply ( layui , exports ) ) ; }
回调
回调