h5 canvas清空画布

画布清空：

1、canvas高度或宽度被重设时，画布内容就会被清空

clearCanvas(){ this.board = this.canvas.getContext("2d"); this.canvas.height = this.canvas.height; }

2、 使用clearRect方法

this.board = this.canvas.getContext("2d"); clean() { this.board.clearRect(0, 0, this.canvas.width, this.canvas.height); },

3、使用颜色填充清空画布