純JS為DOM添加html字符串：appendHTML方法和prependHTML方法

jQuery  append() 方法中可以直接添加字符，如：$("p").append(" <b>Hello world!</b>");

怎么用js實現呢：

appendHTML:

HTMLElement.prototype.appendHTML = function(html) {
    var divTemp = document.createElement("div"), nodes = null
        // 文檔片段，一次性append，提高性能
        , fragment = document.createDocumentFragment();
    divTemp.innerHTML = html;
    nodes = divTemp.childNodes;
    for (var i=0, length=nodes.length; i<length; i+=1) {
       fragment.appendChild(nodes[i].cloneNode(true));
    }
    this.appendChild(fragment);
    // 據說下面這樣子世界會更清凈
    nodes = null;
    fragment = null;
};

 

prependHTML:

var prependHTML = function(el, html) {
    var divTemp = document.createElement("div"), nodes = null
        , fragment = document.createDocumentFragment();

    divTemp.innerHTML = html;
    nodes = divTemp.childNodes;
    for (var i=0, length=nodes.length; i<length; i+=1) {
       fragment.appendChild(nodes[i].cloneNode(true));
    }
    // 插入到容器的前面 - 差異所在
    el.insertBefore(fragment, el.firstChild);
    // 內存回收？
    nodes = null;
    fragment = null;
};

 

轉自：https://www.iteye.com/blog/shenchuochuo-2197445

原文：https://www.zhangxinxu.com/wordpress/2013/05/js-dom-basic-useful-method/

$("p").append(" <b>Hello world!</b>");