(v) Learn the FirstChild properties of JavaScript

Reference: http://www.w3school.com.cn/jsref/prop_node_firstchild.asp

Definition and usage

The FirstChild property returns the first child node of the specified node, to the Node object.

Note: In HTML, the text itself is the parent node of the HTML element, and the HEAD and BODY are child nodes of the HTML element.

Instance:

<! DOCTYPE Html>"Div"><p> I am Div's firstchild</p></div><p id="Demo"> Click the button to get the node name of the first child node in the document. </p><button onclick="myFunction ()"> Try </button><script>function MyFunction () {varX=document.getelementbyid ("Demo"); X.innerhtml=document.getelementbyid ("Div"). Firstchild.nodename;}</script></body>
(v) Learn the FirstChild properties of JavaScript