优化图片预览组件，支持缩略图加载失败回退

Tevin

2024-03-20 01cf735453bb4f2757615beab5ee72480c07e417

 forms/userSignature/CUserSignature.vue

@@ -86,8 +86,7 @@
                    if (sign.indexOf('http') >= 0) {
                        this.itemRes.onChange(sign);
                    } else {
                        const url = this._transBase64ToBlob(sign);
                        this.itemRes.onChange(url);
                        this.itemRes.onChange(sign);
                    }
                });
            }
@@ -150,7 +149,7 @@
                    if (res2.state.code === 2000) {
                        const serverUrl = $fetchCommon.transImgPath(
                            'fix',
                            res2.data.src || res2.data.file || res2.data.url
                            res2.data.src || res2.data.file || res2.data.url,
                        );
                        this.itemRes.onChange(serverUrl);
                        callback('success');