HTML canvas画布
- fillStyle
- strokeStyle
- shadowColor
- shadowBlur
- shadowOffsetX
- shadowOffsetY
- createLinearGradient()
- createPattern()
- createRadialGradient()
- addColorStop()
- lineCap
- lineJoin
- lineWidth
- miterLimit
- rect()
- fillRect()
- strokeRect()
- clearRect()
- fill()
- stroke()
- beginPath()
- moveTo()
- closePath()
- lineTo()
- clip()
- quadraticCurveTo()
- bezierCurveTo()
- arc()
- arcTo()
- isPointInPath()
- scale()
- rotate()
- translate()
- transform()
- setTransform()
- font
- textAlign
- textBaseline
- fillText()
- strokeText()
- measureText()
- drawImage()
- width
- height
- data
- createImageData()
- getImageData()
- putImageData()
- globalAlpha
- globalCompositeOperation