webview loadurl问题：

现象：

webView.loadUrl("javascript:" + callback + "('" + params + "')");

params值：

{"MSG":"交易成功","sgnNo":"","resultId":"00000000","sgnAcctId":"6217770011816505","rdrctUrl":"render.alipay.com/p/s/i/?sche…

js收到的值：

"{"MSG":"交易成功","sgnNo":"","resultId":"00000000","sgnAcctId":"6217776003246031","rdrctUrl":"render.alipay.com/p/s/i/?sche…"

定位原因：

webview的系统源码中loadUrl调用js或url时，会对里面参数encode部分，默认做一次decode处理