Document:doctype 属性
        
        
          
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                  Widely available
                
                
              
        
        
        
          
                
              
                
              
                
              
        
        
      
      This feature is well established and works across many devices and browser versions. It’s been available across browsers since 2015年7月.
Document 接口的 doctype 只读属性表示与当前文档关联的文档类型声明(DTD)的 DocumentType 对象。
值
DocumentType 对象。
示例
js
const doctypeObj = document.doctype;
console.log(`doctypeObj.name: ${doctypeObj.name}`);
console.log(`doctypeObj.internalSubset: ${doctypeObj.internalSubset}`);
console.log(`doctypeObj.publicId: ${doctypeObj.publicId}`);
console.log(`doctypeObj.systemId: ${doctypeObj.systemId}`);
备注
如果当前文档没有关联 DTD,该属性将返回 null。
DOM 第 2 级规范不支持编辑文档类型声明。
规范
| Specification | 
|---|
| DOM> # ref-for-dom-document-doctype①> | 
浏览器兼容性
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