复制并分配文档对象的本机方法(Copy and assign native method of document object)

我想在String对象上执行document.getElementById（）方法。

String.prototype.getElementById = document.getElementById;
test = new String('<p id="para1">Irgendein Text</p>');
console.log(test.getElementById("para1")) 
  
 
 
 上面的尝试返回： Uncaught TypeError: Illegal invocation 
 
 有没有办法在字符串上执行getElementByID方法？ 
 
 编辑： 
 
 谢谢你的魅力： 
 
var test = (new DOMParser()).parseFromString('<dummy/>', 'text/xml');
test.getElementsByTagName('dummy')[0].innerHTML = '<p id="para1">Irgendein Text</p>';
console.log(doc.getElementById('para1'));
 
 返回<p id="para1">Irgendein Text</p> 
I want to perform the document.getElementById() method on the String object.
 
 
 
 
  
  
String.prototype.getElementById = document.getElementById;
test = new String('<p id="para1">Irgendein Text</p>');
console.log(test.getElementById("para1")) 
  
 
 
The above attempt returns: Uncaught TypeError: Illegal invocation
 
Is there a way to perform the getElementByID method on a string?
 
Edit:
 
Thanks works like a charm:
 
var test = (new DOMParser()).parseFromString('<dummy/>', 'text/xml');
test.getElementsByTagName('dummy')[0].innerHTML = '<p id="para1">Irgendein Text</p>';
console.log(doc.getElementById('para1'));
 
Returns <p id="para1">Irgendein Text</p>
                
最满意答案
                
                    
                        
 字符串不是文档，因此不能通过getElementById等DOM方法遍历它。 听起来您想将字符串视为dom选择，然后对其运行查询。 querySelector允许您对一大块DOM或整个文档运行查询，以便您可以使用它。 document.querySelector('#id')将生成与document.getElementById('id')相同的元素集。 
 
 将字符串转换为DOM的简单方法是将其设置为另一个元素的innerHTML 。 所以 
 
var wrapper= document.createElement('div');
wrapper.innerHTML= '<p id="para1">Irgendein Text</p>';
console.log(wrapper.querySelector('#para1')); // your p tag
 
 另请参阅将HTML字符串转换为DOM元素？ 
A string is not a document, so it can't be traversed by DOM methods like getElementById. It sounds like you want to treat a string as a dom selection and then run a query on it. querySelector lets you run a query on a chunk of DOM or the whole document so you can use that. document.querySelector('#id') will yield the same set of elements as document.getElementById('id'). 
 
An easy way to turn a string into DOM is to set it to the innerHTML of another element. So
 
var wrapper= document.createElement('div');
wrapper.innerHTML= '<p id="para1">Irgendein Text</p>';
console.log(wrapper.querySelector('#para1')); // your p tag
 
See also Converting HTML string into DOM elements?