Question

您好，从以下代码我能够下载chrome＆amp; amp; firefox但没有在safari浏览器中工作，它正在抛出错误

TypeError：'undefined'不是函数（评估'canvas.toBlob（blobCallback（'wallpaperdeae'））'）

$（ “＃保存”）。单击（函数（）{

   function blobCallback(iconName) {
        return function (b) {

            var a = document.getElementById('download');
            a.download = iconName + ".jpg";
            a.href = window.URL.createObjectURL(b);
        }
    }
    canvas.toBlob(blobCallback('wallpaperdeae'));

});

感谢

Answer 1

我不认为Safari支持toBlob方法：

https://developer.mozilla.org/en-US/docs/Web/API/HTMLCanvasElement/toBlob#Browser_compatibility

据此，它仅适用于Chrome 50+和Firefox（19+用于基本支持，25+用于图像质量参数），在IE 10及更高版本中有一些基本支持。

所以对Safari没有任何支持。

Answer 2

有一个"low performance polyfill based on toDataURL" posted on MDN

12:04:49,360 ERROR [AppServiceLocator] [ERROR IN AppServiceLocator:] javax.naming.CommunicationException: WFNAM00018: Failed to connect to remote host [Root exception is java.net.ConnectException: Connection timed out: no further information]
12:05:10,403 ERROR [AppServiceLocator] [ERROR IN AppServiceLocator:] javax.naming.CommunicationException: WFNAM00018: Failed to connect to remote host [Root exception is java.net.ConnectException: Connection timed out: no further information]
12:05:31,408 ERROR [AppServiceLocator] [ERROR IN AppServiceLocator:] javax.naming.CommunicationException: WFNAM00018: Failed to connect to remote host [Root exception is java.net.ConnectException: Connection timed out: no further information]
12:05:31,408 ERROR [AppServiceLocator] [ERROR IN GETTING REMOTE HOME:] interface com.ipacs.framework.controller.interfaces.ServerControllerHome
12:05:31,410 ERROR [EJBModelLoader] [AppServiceLocatorException:]
com.ipacs.als.gui.exception.AppServiceLocatorException: [ERROR IN GETTING REMOTE HOME:] interface com.ipacs.framework.controller.interfaces.ServerControllerHome
    at com.ipacs.als.gui.util.AppServiceLocator.getRemoteHome(AppServiceLocator.java:93)
    at com.ipacs.als.gui.model.EJBModelLoader.doBusinessAction(EJBModelLoader.java:83)
    at com.ipacs.als.gui.model.EJBModelLoader.doBusinessEvent(EJBModelLoader.java:66)
    at com.ipacs.als.gui.model.ModelLoader.doBusiness(ModelLoader.java:37)
    at com.ipacs.als.gui.model.BusinessEventHelper.callBizService(BusinessEventHelper.java:285)
    at com.ipacs.als.gui.model.BusinessEventHelper.doBusiness(BusinessEventHelper.java:175)
    at com.ipacs.als.gui.model.BusinessEventHelper.doBusiness(BusinessEventHelper.java:167)
    at com.ipacs.als.gui.model.BusinessEventHelper.doBusiness(BusinessEventHelper.java:162)
    at com.ipacs.als.gui.model.BusinessEventHelper.doBusiness(BusinessEventHelper.java:348)
    at com.ipacs.ntuc.Startup.initProject(Startup.java:232)
    at com.ipacs.ntuc.Startup.main(Startup.java:223)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at com.sun.javaws.Launcher.executeApplication(Unknown Source)
    at com.sun.javaws.Launcher.executeMainClass(Unknown Source)
    at com.sun.javaws.Launcher.doLaunchApp(Unknown Source)
    at com.sun.javaws.Launcher.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)
12:05:31,420 ERROR [Startup] com.ipacs.als.gui.exception.AppServiceLocatorException: [ERROR IN GETTING REMOTE HOME:] interface com.ipacs.framework.controller.interfaces.ServerControllerHome
Kewill Forwarding Application Run Time Exception
    at com.ipacs.als.gui.model.EJBModelLoader.doBusinessAction(EJBModelLoader.java:104)
    at com.ipacs.als.gui.model.EJBModelLoader.doBusinessEvent(EJBModelLoader.java:66)
    at com.ipacs.als.gui.model.ModelLoader.doBusiness(ModelLoader.java:37)
    at com.ipacs.als.gui.model.BusinessEventHelper.callBizService(BusinessEventHelper.java:285)
    at com.ipacs.als.gui.model.BusinessEventHelper.doBusiness(BusinessEventHelper.java:175)
    at com.ipacs.als.gui.model.BusinessEventHelper.doBusiness(BusinessEventHelper.java:167)
    at com.ipacs.als.gui.model.BusinessEventHelper.doBusiness(BusinessEventHelper.java:162)
    at com.ipacs.als.gui.model.BusinessEventHelper.doBusiness(BusinessEventHelper.java:348)
    at com.ipacs.ntuc.Startup.initProject(Startup.java:232)
    at com.ipacs.ntuc.Startup.main(Startup.java:223)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at com.sun.javaws.Launcher.executeApplication(Unknown Source)
    at com.sun.javaws.Launcher.executeMainClass(Unknown Source)
    at com.sun.javaws.Launcher.doLaunchApp(Unknown Source)
    at com.sun.javaws.Launcher.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)
Caused by: com.ipacs.als.gui.exception.AppServiceLocatorException: [ERROR IN GETTING REMOTE HOME:] interface com.ipacs.framework.controller.interfaces.ServerControllerHome
    at com.ipacs.als.gui.util.AppServiceLocator.getRemoteHome(AppServiceLocator.java:93)
    at com.ipacs.als.gui.model.EJBModelLoader.doBusinessAction(EJBModelLoader.java:83)
    ... 18 more
12:05:52,566 ERROR [AppServiceLocator] [ERROR IN AppServiceLocator:] javax.naming.CommunicationException: WFNAM00018: Failed to connect to remote host [Root exception is java.net.ConnectException: Connection timed out: no further information]
12:06:13,575 ERROR [AppServiceLocator] [ERROR IN AppServiceLocator:] javax.naming.CommunicationException: WFNAM00018: Failed to connect to remote host [Root exception is java.net.ConnectException: Connection timed out: no further information]

Canvas toBlob在Safari中不被识别为函数

2 个答案: