`
let parser = new DOMParser()
let _document = parser.parseFromString($string, "text/html")
let ele = _document.getElementsByTagName("IMG")
for(let i = 0; i < ele.length; i++) {
let wrapper = _document.createElement('a');
wrapper.href = ele[i].src
wrapper.setAttribute('data-fancybox', 'gallery');
let myImg = ele[i]
wrapper.appendChild(myImg.cloneNode(true));
myImg.parentNode.replaceChild(wrapper, myImg);
}
let mainEle = document.getElementById("posttext")
mainEle.appendChild(_document.getElementsByTagName("BODY")[0])
