webview调用js注意事项

4.2 之前向webview注入的对象所暴露的接口toString没有注释语句@JavascriptInterface，
而4.2 及以后的则多了注释语句@JavascriptInterface

class JsObject {    @JavascriptInterface    public String toString() { return "injectedObject"; } } webView.addJavascriptInterface(new JsObject(), "injectedObject"); webView.loadData("", "text/html", null); webView.loadUrl("javascript:alert(injectedObject.toString())");