on

英[ɒn]   美[ɑ:n]  

prep. (indicating direction) to; (indicating object) to; (indicating position) on...; (indicating time) at the time of...

adv. (put, wear, connect) on; forward, (continue) go on

adj. active situation, state ;used; happening; planned

mouse

英[maʊs] 美[maʊs]

n. Mouse; mouse ; a shy [timid] person; [informal] bruised eyes

vi.catching mice; spying, secretly looking for

Plural: mice

down

English[daʊn] US[daʊn]

adv. Down; (sitting, falling, lying) down; (indicating the limit of range or order) down to

prep. (from a height) downward; (indicating position) below...; (indicating direction) down along...; (indicating time) since...

adj. Downward; frustrated; computer or computer system shutdown; (to...) behind the opponent

n. (bird's) down; down; soft hair; hair

vt. To put down; to drink (especially in a big mouth or quickly); to cause to fall; to shoot down (enemy planes, etc.)

vi. Come down; descend; [often used in imperative sentences] go down; lie down

Third person singular: downs Plural: downs Present participle: downing Past tense: downed Past participle: downed

javascript onmousedown attribute syntax

Function: Occurs when the mouse button is pressed.

Syntax: onmousedown="SomeJavaScriptCode"

Parameters: SomeJavaScriptCode Required. Specifies the JavaScript to be executed when this event occurs.​

javascript onmousedown attribute example

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

</head>
<body>

<img src="http://img.php.cn/upload/article/000/005/656/5af270fd37755429.jpg" onmousedown="alert('You clicked the picture!')" />
<p>点击图片触发事件</p>
</body>
</html>

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