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我让两个线程同时调用 Javascript 的函数,其代码的第一个语句是一个警报语句,显示字符串“hello”和“world”。

我希望只有当我单击带有“hello”的警报时,才会显示警报“world”。但实际上警报“world”对话框将覆盖之前的“hello”对话框。

并且 alert("hello") 之后的代码根本没有执行。为什么会这样?

private void OnJSCallback(object sender, JSCallbackEventArgs e)
{
    //Console.WriteLine("hi");
    MessageBox.Show("hi");

    if (count == 0)
    {
        Thread worker = new Thread(func =>
            {
                Thread.Sleep(3000);
                OnReturn("CallFromNative1", "hello");
            });
        worker.Start();
    }

    if (count == 1)
    {
        Thread worker = new Thread(func =>
        {
            Thread.Sleep(3000);
            OnReturn("CallFromNative2", "world");
        });
        worker.Start();
    }
    count++;
}

private void OnReturn(string call, string ret)
{
    webControl.Dispatcher.BeginInvoke((ThreadStart) delegate()
    {
        Console.WriteLine("before call javascript");
        webControl.CallJavascriptFunction("", call, new JSValue[] { new JSValue(ret)});
    });
}

JavaScript 代码是:

external.JSCallback("hello", "world");
external.JSCallback("wtf", "dude");
var count = 0;

function CallFromNative1()
{
alert(arguments[0]);
var i = 0;
count = 10;
alert(count);
for(i=0; i<1000; i++)
{
    count += i;
}
alert(count);
}

function CallFromNative2()
{
    alert(arguments[0]);
    alert(count);
}
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