function renderDom(str){    var _div = document.createElement('div');    _div.innerHTML = str;    var dom_temp = _div.childNodes    for (var i = 0, len = dom_temp.length; i < len; i++) {        if (dom_temp[i].nodeType === 1) {            return dom_temp[i];        }    }    return}

原生js快速渲染dom节点