<!DOCTYPE html><html><body><h1>www.sharejs.com</h1><form id="form1"><button id="button1" type="button">Click me!</button></form><p>The id of the form containing the button is:<script>document.write(document.getElementById("button1").form.id);</script></p></body></html>运行结果如下:
The id of the form containing the button is:button1希望本文所述对大家的javascript程序设计有所帮助。