Commit403151b

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Fire an event listener only once.

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Original file line number	Diff line number	Diff line change
`@@ -457,3 +457,22 @@ returns`
`457`	`457`	`*/`
`458`	`458`
`459`	`459`	```
	`460`	`+`
	`461`	`+`
	`462`	`+# Fire an event listener only once.`
	`463`	+```javascript
	`464`	`+constel=document.getElementById("btn");`
	`465`	`+`
	`466`	`+functionmyClickHandler(){`
	`467`	`+console.log('this click will only fire once')`
	`468`	`+}`
	`469`	`+`
	`470`	`+`
	`471`	`+el.addEventListener('click', myClickHandler, {`
	`472`	`+ once:true,`
	`473`	`+});`
	`474`	`+`
	`475`	+```
	`476`	`+`
	`477`	`+`
	`478`	`+`

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