修改接口，完善代码

Author: zerob13

ebook/13.5.md

@@ -66,7 +66,7 @@ ViewController:
 	}
 
 	func (this *ViewController) Get() {
-		id, _ := strconv.Atoi(this.Ctx.Input.Params[":id"])
+		id, _ := strconv.Atoi(this.Ctx.Input.Params(":id"))
 		this.Data["Post"] = models.GetBlog(id)
 		this.Layout = "layout.tpl"
 		this.TplNames = "view.tpl"
@@ -100,7 +100,7 @@ EditController
 	}
 
 	func (this *EditController) Get() {
-		id, _ := strconv.Atoi(this.Ctx.Input.Params[":id"])
+		id, _ := strconv.Atoi(this.Ctx.Input.Params(":id"))
 		this.Data["Post"] = models.GetBlog(id)
 		this.Layout = "layout.tpl"
 		this.TplNames = "new.tpl"
@@ -124,7 +124,7 @@ DeleteController
 	}
 
 	func (this *DeleteController) Get() {
-		id, _ := strconv.Atoi(this.Ctx.Input.Params[":id"])
+		id, _ := strconv.Atoi(this.Ctx.Input.Params(":id"))
 		blog := GetBlog(id int)
 		this.Data["Post"] = blog
 		models.DelBlog(blog)