试卷预览答题点展示bugfix

src/features/examwork/StudentExamDetail/spins/renderJSON.js

@@ -149,8 +149,7 @@ function renderBlock(block, inline) {
     }
   } else if (block.type === "cloze") {
     node = document.createElement("img");
-
-    node.src = `/img/editor/answer_point_${block.value}.png`;
+    node.src = getAnswerPointImg(block.value);
     node.dataset.isAnswerPoint = true;
     node.dataset.order = block.value;
   } else if (block.type === "audio") {
@@ -256,3 +255,20 @@ export function numberToUpperCase(val) {
 
   return String.fromCharCode(64 + val);
 }
+
+/**
+ * 获取答题点序号图片base64
+ * @param {number} serialNo 答题点序号
+ * @returns dataUrl
+ */
+export function getAnswerPointImg(serialNo) {
+  const canvas = document.createElement("canvas");
+  const ctx = canvas.getContext("2d");
+  canvas.width = 64;
+  canvas.height = 32;
+  ctx.font = "bolder 30px serif";
+  ctx.textAlign = "center";
+  ctx.textBaseline = "middle";
+  ctx.fillText(`（${serialNo}）`, 32, 16);
+  return canvas.toDataURL();
+}