while(index<string.length){
character=string.charAt(index)
context.save()
context.beginPath()
context.translate(circle.x+Math.cos((Math.PI/180)*angle)*radius,circle.y-Math.sin((Math.PI/180)*angle)*radius)
context.rotate((Math.PI/2)-(Math.PI/180)*angle) //Math.PI/2为旋转90度 Math.PI/180*X为旋转多少度
context.fillText(character,0,0)
context.strokeText(character,0,0)
angle-=angleDecrement
index++
context.restore()
}
context.restore()
}
context.textAlign="center"
context.textBaseLine="middle"
drawCircularText("clockwise around the circle",360,10) //第三个参数表示文字首位是否相接 差了多少弧度
