javascript地球卫星同步动画

var canvas = document.getElementById('Canvas_Six');var context_six = canvas.getContext('2d');var i = 0, j = 10;var tm;var imgSat = new Image();function orbit() {i = i + j;if (i >= 360) { i = 0; }var t = Math.round(i / 15);if (t < 10) { t = '0' + t + ' : 00'; }else{ t = t + ' : 00'; }if (i <= 59 || i > 130) {x = 250 + 210 * Math.cos(i * Math.PI / 180); y = 230 + 40 * Math.sin(-i * Math.PI / 180);}else{ imgSat.src = ''; }context_six.clearRect(0, 0, 500, 500);context_six.font = "bold 30pt Calibri";context_six.fillText('Time: ' + t, 160, 30);context_six.font = "18pt Calibri";context_six.fillText('Vivax Solutions', 340, 490);context_six.fillStyle = 'green';context_six.drawImage(imgSat, x, y);imgSat.src = 'sat.png';}window.setInterval('orbit()', 180);

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