html5 Canvas draws lines closePath() example code _html5 tutorial skills

Core code:

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The code is as follows:

$(function(){
var can = $("#can").get(0);
var txi = can.getContext("2d");
txi.beginPath();
txi.moveTo( 105,105);
txi.lineTo(105,45);
txi.lineTo(45,105);
txi.closePath();
txi.stroke();
txi.beginPath( );
txi.moveTo(25,25);
txi.lineTo(100,25);
txi.lineTo(25,100);
txi.stroke();
})

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The code is as follows:

closePath(); Close the path
The picture below is one that uses, close, One is useless: