on

English [?n] US [ɑ:n]

prep.(??? ???) to;(??? ???) on...; ..

adv. on; ???, (??) ???

adj. ?? ??, ?? ?; ???

英[s??l?kt ]

vt.Choose; select

adj.Selected; ???; ????, ????

??: ?? ???: ???

?????? onselect ?? ???

??: ??? ??? ???? ???? ?????.

??: ??onselect="SomeJavaScriptCode"

????: SomeJavaScriptCode ?????. ? ???? ??? ? ??? JavaScript? ?????.?

?????? onselect ?? ?

<html>
<head>
    <meta charset="UTF-8">

</head>

<body>

<form>

Select text: <input type="text" value="Hello world!"
onselect="alert('你選中了文本.')" />
<br /><br />
Select text: <textarea cols="20" rows="5"
onselect="alert('你選中了文本.')">
Hello world!</textarea>
<p>選中文本框中的內(nèi)容觸發(fā)事件</p>
</form>

</body>

</html>

???? ?? ?

??? ????? ??? "???? ??" ??? ?????