revert:撤销消息通知匹配图片修改

src/pages/index/learn.vue

@@ -577,8 +577,14 @@ export default {
         },
         //取文本第一张图片
         imgUrlFun(str) {
-            var data = /http[a-zA-z]+:\/\/[^\"]*/.exec(str);
-            return data?data[0]:'';
+            var data = "";
+            str.replace(
+                /<img [^>]*src=['"]([^'"]+)[^>]*>/,
+                function (match, capture) {
+                    data = capture;
+                }
+            );
+            return data;
         },
         //取文本信息
         getText(str) {