swift中wkwebview OC向js传值（token和userid等）

WKUserScript就是帮助我们完成JS注入的类，它能帮助我们在页面填充前或js填充完成后调用。

let key = (String(format: "localStorage.setItem(\"token\",'%@');localStorage.setItem(\"project_id\",'%@');localStorage.setItem(\"user_id\",'%@');",User.defaultUser.token!,User.defaultUser.getProjectId(),(String(format: "%@",User.defaultUser.id!))))

        letwkUScript =WKUserScript(source: key, injectionTime:WKUserScriptInjectionTime.atDocumentStart, forMainFrameOnly:false)

        let config = WKWebViewConfiguration()

        letde =WeakScriptMessageDelegate(delegate:selfasWKScriptMessageHandler)

        config.userContentController.add(de!, name:"iOS")

        config.userContentController.addUserScript(wkUScript)

        webView=WKWebView(frame: .zero, configuration: config)

        webView.scrollView.delegate = self