修改了签名板和关联选项设置不兼容的bug

src/widget/writingboard/vueSignature.vue

@@ -102,20 +102,24 @@
   const getSizeRatio = () => {
     return !props.fullScreen && props.backIsCenter
   }
-  const setCanvasImageBack = (status: any) => {
-    const canvas = canvasRef.value as HTMLCanvasElement
-    let pat = canvasTxt.value?.createPattern(canvasBackDom.value, (props.isRepeat || "no-repeat"));
-    canvasTxt.value?.rect(0,0,canvas.width ,canvas.height)
-    canvasTxt!.value!.fillStyle = (pat as any); 
-    canvasTxt.value?.fill();
-    if (status) {
-        autoDraw(null, null)
+  const setCanvasImageBack = (status: any,canvas:any) => {
+    //const canvas = canvasRef.value as HTMLCanvasElement
+    //console.log(canvas)
+    if(typeof(canvas)!="undefined"&&typeof(canvas.width)!="undefined"){
+      let pat = canvasTxt.value?.createPattern(canvasBackDom.value, (props.isRepeat || "no-repeat"));
+      canvasTxt.value?.rect(0,0,canvas.width ,canvas.height)
+      canvasTxt!.value!.fillStyle = (pat as any); 
+      canvasTxt.value?.fill();
+      if (status) {
+          autoDraw(null, null)
+      }
     }
+    
   }
-  const setCanvasBack = (status: any) => {
-     const canvas = canvasRef.value as HTMLCanvasElement
+  const setCanvasBack = (status: any,canvas:any) => {
+     //const canvas = canvasRef.value as HTMLCanvasElement
      if (props.canvasBack && canvasBackDom.value && isImgaes(props.canvasBack)) {
-      setCanvasImageBack(status)
+      setCanvasImageBack(status,canvas)//liwenxuan
       } else {
         canvas.style.background = canvasBackground.value
       }
@@ -145,12 +149,19 @@
       canvasTxt.value?.scale(1 * sratio.value, 1 * sratio.value)
       sratio.value = realw / (domPatams.width ? domPatams.width : props.fullScreen ? screenPatams.width : props.width)
       canvasTxt.value?.scale(1 / sratio.value, 1 / sratio.value)
+      
       if (props.canvasBack) {
         let IntervaId = setInterval(() => {
-          if ((canvasBackDom.value && isLoad.value) || !isImgaes(props.canvasBack)) {
-            setCanvasBack(status)
-            clearInterval(IntervaId)
+          //console.log("111111111111111111111111111111111111111111111111111111")
+          //console.log(canvas)
+          if(typeof(canvas)!="undefined"){
+            console.log(canvas)
+            if ((canvasBackDom.value && isLoad.value) || !isImgaes(props.canvasBack)) {
+              setCanvasBack(status,canvas)//liwenxuan
+              clearInterval(IntervaId)
+            }
           }
+          
         }, 100)
       } else {
         if (status) {