动态创建HTML元素

示例

var fragment = document.createDocumentFragment();
var elt = document.createElement('img');
elt.className = 'mui-collapse-content';
elt.style.width =  '100%';
elt.style.height =  '100%';
var imgdata = result;
elt.src = imgdata;
fragment.appendChild(elt);
Callback(fragment);