The getElementsByTagName() is a method of the document or element object. · The getElementsByTagName() accepts a tag name and returns a list of elements with the ... ... <看更多>

The heart of the problem is that these methods... document.getElementById(...) document.getElementsByTagName(...). ... <看更多>

Just like Document/getElementsByTagName except that it only works within the scope of this ShadowRoot's shadow tree. ... <看更多>

TypeScript Version: 2.1.4 Code const nodeList = document.getElementsByTagName("p"); nodeList instanceof NodeList; // returns false, although lib.d.ts says ... ... <看更多>