<!DOCTYPE html><html><body><p id="header">Old Header</p><script>var element=document.getElementById("header");//換成getElementsByTagName("p")就不行element.innerHTML="New Header";document.write(element.innerHTML);</script><p>"Old Header" 已被修改為 "New Header"。</p>//換成TagName后原來(lái)的沒被修改</body></html>
求解，getElementById()與getElementsByTagName()的區(qū)別？
qq_丟失的那五年_0
2016-01-28 16:29:36
