refactor(Html2Image): bump version 9.0.0-beta02 (#335)

* refactor: 更新代码

* chore: bump version 9.0.0-beta02

Author: ArgoZhang

src/components/BootstrapBlazor.Html2Image/BootstrapBlazor.Html2Image.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk.Razor">
 
   <PropertyGroup>
-    <Version>9.0.0-beta01</Version>
+    <Version>9.0.0-beta02</Version>
   </PropertyGroup>
 
   <PropertyGroup>

src/components/BootstrapBlazor.Html2Image/wwwroot/html2image.js

@@ -4,6 +4,7 @@ export async function execute(selector, methodName, options) {
     let data = null;
     const el = document.querySelector(selector);
     if (el) {
+        options ??= {};
         const fn = methodName === 'toBlob'
             ? htmlToImage[methodName]
             : getMethod(options);
@@ -14,13 +15,11 @@ export async function execute(selector, methodName, options) {
 
 const getMethod = options => {
     let ret = "toPng";
-    if (options) {
-        const { methodName } = options;
-        delete options.methodName;
+    const {methodName} = options;
+    delete options.methodName;
 
-        if (['toPng', 'toJpeg', 'toSvg', 'toCanvas'].find(i => i === methodName)) {
-            ret = methodName;
-        }
+    if (['toPng', 'toJpeg', 'toSvg', 'toCanvas'].find(i => i === methodName)) {
+        ret = methodName;
     }
     return htmlToImage[ret];
 }