增加一个请求处理前的回调 reviewed by 枪兵

@@ -110,6 +110,15 @@
  */
 - (void)explorerDidDetectParameters:(NSDictionary *)params;
 
+/**
+ @brief 将要加载请求前的回调
+ 
+ @param request 请求
+ 
+ @since 1.0.7
+ */
+- (void)explorerWillLoadRequest:(NSMutableURLRequest *)request;
+
 #pragma mark Native
 /**
  *  本地机能是否可以被触发，默认是YES

@@ -211,7 +211,11 @@ static float kprogressViewRadius = 2.0f;
 - (void)loadWebUrl:(NSString *)url
 {
     self.startPage = url;
-    [self.webView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:url]]];
+    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:url]];
+    if ([self.delegate respondsToSelector:@selector(explorerWillLoadRequest:)]) {
+        [self.delegate explorerWillLoadRequest:request];
+    }
+    [self.webView loadRequest:request];
 }
 
 - (void)loadHTMLString:(NSString *)html