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<!doctype html><html><head><meta charset="utf-8"><title>無標題文檔</title></head><body><div id="demo"><ul><li>123</li><li>123</li><li>123</li><li>123</li></ul><a href=#>123</a><a href=#>456</a><span>147</span><span>258</span></div><script>var d=document.getElementById("demo");var tag=d.getElementsByTagName("*");alert(tag.length);</script></body></html>
var d=document.getElementById("demo");
var tag=d.getElementsByTagName("*");
利用萬用字元匹配ID為demo下面的所有元素
也可以直接寫為：document.getElementById("demo").getElementsByTagName("*")
前面的一種寫法更加便捷，推薦用前面 的一種。
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