为什么它没有显示消息“ Hello world！”？
[英]Why does this not show the message “Hello world!”?
问题描述
var div = document.createElement("tempdiv");
div.innerHTML = "<html><body><div id='test'>Hello World!</div></body></html>";
alert(div.getElementById("test").innerHTML);
I get the error " Uncaught TypeError: Object #HTMLUnknownElement has no method 'getElementById' " 
我收到错误“ 未捕获的TypeError：对象#HTMLUnknownElement没有方法'getElementById' ”
3 个解决方案
解决方案1
1 2013-04-10 14:12:49
The getElementById method only exists on the document object. getElementById方法仅存在于文档对象上。 It is not supported by individual DOM elements. 单个DOM元素不支持它。 If you were to add the element to the DOM, you could call document.getElementById("test").innerHTML; 如果要将元素添加到DOM，则可以调用document.getElementById("test").innerHTML; to get your text. 得到您的文本。
解决方案2
0 已采纳 2013-04-10 14:15:58
Elements not in the document are not searched by getElementById. getElementById不会搜索文档中未包含的元素。 When creating an element and assigning it an ID, you have to insert the element into the document tree with insertBefore or a similar method before you can access it with getElementById. 创建元素并为其分配ID时，必须先使用insertBefore或类似方法将元素插入文档树中，然后才能使用getElementById访问它。
Ref: https://developer.mozilla.org/en-US/docs/DOM/document.getElementById 参考： https : //developer.mozilla.org/zh-CN/docs/DOM/document.getElementById
Example: 例：
var div = document.createElement("div");
document.body.appendChild(div);
div.innerHTML = "<div id='test'>Hello World!</div>";
console.log(document.getElementById("test"));
解决方案3
0 2013-04-10 14:40:33
Don't forget to set an Id in to the created div to be able to select: 不要忘记为创建的div设置ID，以便选择：
var div = document.createElement("div");
div.setAttribute('id', 'idName');
div.innerHTML = "<html><body><div id='test'>Hello World!</div></body></html>";
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