1. innerHTML
innerHTML可以作为获取文本的方法也可以作为修改文本内容的方法 element.innerHTML 会直接返回element节点下所有的HTML化的文本内容<body> <div>文本</div> <div>文本</div> </body>document.body.innerHTML //返回"<div>文本</div><div>文本</div>";同样逆向的：document.body.innerHTM="<div>文本</div><div></div>"会生成<body> <div>文本</div> <div>文本</div></body>！注意 innerHTML方法只能作用于元素节点调用；文本节点并不能使用这个方法返回undefined！
="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>2. nodeValuenodeValue是一个HTML DOM的对象属性；同样的 可以通过 nodeValue设置节点的文本内容也可以直接返回文本内容直接用节点对象调用就都可以： 如上例 document.getElementsByTagName(div)[0].childNodes[0].nodeValue //返回“文本”另外 nodeValue 属性并不只存在于文本节点下 元素节点和属性节点对象也都具有nodeValue属性属性节点的 nodeValue属性返回属性值元素节点的 nodeValue属性返回null="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>
3.textContenttextContent与innerHTML方法类似会返回对象节点下所有的文本内容但是区别为 textContent返回的内容只有去HTML化的文本节点的内容 如上例：document.body.textContent //返回"文本文本" ！注意在DOM中标签换行产生的空白字符会计入DOM中作为文本节点另外IE8以前不支持textContent属性
4.innerText="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>
="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>
="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>innerText方法与textContent方法类似 并且和innerHTML一样也是作用于元素节点上但是浏览器对于这两种方法解析空白字符的机制不一样；不是很常用类似的还有outText outHTML等类似操作文本相关的方法，不是很常用；最后要提醒一点：文本与文本节点一定要区分，有些方法是依靠元素节点返回子文本内容，有些方法是文本节点返回自身文本内容，文本节点是对象而文本只是字符串。
类似的还有outText outHTML等类似操作文本相关的方法，不是很常用；最后要提醒一点：文本与文本节点一定要区分，有些方法是依靠元素节点返回子文本内容，有些方法是文本节点返回自身文本内容，文本节点是对象而文本只是字符串。 ="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>="box-sizing:>