摘要：1.Canvas画圆context.arc(x, y, radius, startAngle, endAngle, anticlockwise)参数 x,y表示圆心radius半径startAngle起始弧度endAngle终止弧度anticlockwise是否为逆时针方向<script type="text/javascript"> function drawScreen() { var h = 180; var x = document.getElementById("myCanvas"); context = x.getContext( 阅读全文