一个nice的面试官对面试经验匮乏者的温暖To snow peak,哈哈
drawRadial(100, 100, 30, 10) /** *@description *用canvas画放射图 * *@params *x0、y0原点坐标,r放射图半径,放射图平均角度 * * @author xp */ function drawRadial(x0, y0, r, angle){ r = r || 10; angle = angle || 10; var len = 360/angle; var radian = 2*Math.PI*angle/360; var c=document.getElementById("myCanvas"); var ctx=c.getContext("2d"); for (var i=1; i<=len; i++) { (function(j){ setTimeout( function timer() { x1 = x0 + r*Math.cos(radian*j) y1 = y0 + r*Math.sin(radian*j) ctx.beginPath(); ctx.moveTo(x0,y0); ctx.lineTo(x1,y1); ctx.stroke(); }, j*1000 ); }(i)) } }