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                            ## Canvas畫直線

~~~
var canvas = document.getElementById("myCanvas");
var ctx = canvas.getContext("2d");
ctx.moveTo(0,0);
ctx.lineTo(100,100);
ctx.lineTo(100,200);
//設置線條顏色
ctx.strokeStyle = "red";
ctx.stroke();

debugger;

ctx.moveTo(100,0);
ctx.lineTo(200,100);
ctx.lineTo(200,200);
//設置線條顏色
ctx.strokeStyle = "black";
ctx.stroke();
~~~

### 方法
1. moveTo(x,y) ---移動至某點

2. lineTo(x,y) ---畫直線至某點

3. stroke() ---將內存中的路徑畫出來

> 上面代碼第一跟線會被畫兩次，解決方法
> 1. 所有線畫完之后，執行一次stroke()方法
> 2. 每條線開始繪制之前beginPtah()

4. beginPath()---將之前內存中的路徑去掉


                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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