what is different between webview.LoadURL and webview.SetPage

I have a html text, there is <script> tag in it, and the script need load some out source.
if I save it as a xxx.htm, and use LoadURL(file:///xxxx.htm), we can get the result.but if I use SetPage, I get a blank page.
I saw the SetPage has 2 parameter, the second one is url, what should I give?does the SetPage method run the js as LoadURL?

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