?<script type="text/javascript">
???? function contxt() //定義函數(shù)
????? {
???????? alert("哈哈，調(diào)用函數(shù)了!");
????? }
?? </script>

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<form>
????? <input type="button"? value="點擊我" onclick="contxt()" />? 這里寫上調(diào)用的定義函數(shù)名稱

<javascript?type="text/javacript">
????function?cotxt()
????{
????????document.write("ok")?;
????}
????contxt()?;//需要調(diào)用它
</javascript>

<input?type="button"?value="點擊"?onclick="contxt()"?/>

在需要調(diào)用的地方輸入函數(shù)，比如例子里的那個應(yīng)該寫成?onclick="contxt()"?