How to write the code for HTML5 to implement timer

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The code is as follows:

HTML5 timer for relaxing work balance

CountDownSeconds = 60

Var handle = null

/ / window loading

Function onLoadWindow () {

ACanvas = document.getElementById ("countdownCanvas")

Context = aCanvas.getContext ("2d")

Var canvasText = "Press start."

Var xPos = aCanvas.width / 2

Var yPos = aCanvas.height / 2

Context.font = "12pt Century Gothic"

Context.fillStyle = "# 008000;"

Context.textAlign = "Center"

Context.textBaseline = "middle"

Context.fillText (canvasText,xPos,yPos)

ClearInterval (handle)

Handle = null

Alert ("Hey, time's up!" )

Return 0

}

MinStr = Math.floor (countDownSeconds / 60)

SecStr = countDownSeconds%60

If (minStr