selection.setPosition(container,5); 设置光标位置--到尾端
selection.setPosition(container,0); 设置光标位置--到首端
container 为 编辑容器dom，5 为编辑器子元素的长度，
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Title</title> <style> #app{ width:300px; height:100px; border: 1px solid red; } img{ width: 20px; } </style> </head> <body> <!--<div contenteditable="true" id="app"> <img src="a.jpg" alt=""> 123 </div>--> <div contenteditable="true" id="app"> 11<img src="a.jpg" alt=""><img src="a.jpg" alt=""> 00 <span class="sp">123</span> </div> </body> <script> let app = document.querySelector(‘#app‘); app.focus(); let selection = getSelection(); selection.setPosition(app,5); </script> </html>
html 富文本编辑器相关--常用selection range api
原文：http://www.cnblogs.com/WhiteHorseIsNotHorse/p/6705396.html
