分割文本节点

 1 var element = document.createElement("div");

 2 element.className = "message";

 3 

 4 var textNode = document.createTextNode("Hello world!");

 5 element.appendChild(textNode);

 6 

 7 document.body.appendChild(element);

 8 

 9 var newNode = element.firstChild.splitText(5);

10 console.log(element.firstChild.nodeValue);

11 console.log(newNode.nodeValue);

12 console.log(element.childNodes.length);