Class sap.m.routing.RouterModule: sap/m/routing/Router

One way of defining routes is an array:

[
    //Will create a route called 'firstRouter' you can later use this name in navTo to navigate to this route
    {
        name: "firstRoute"
        pattern : "usefulPattern"
    },
    //Will create a route called 'anotherRoute'
    {
        name: "anotherRoute"
        pattern : "anotherPattern"
    }
]

The alternative way of defining routes is an Object.
If you choose this way, the name attribute is the name of the property.

{
    //Will create a route called 'firstRouter' you can later use this name in navTo to navigate to this route
    firstRoute : {
        pattern : "usefulPattern"
    },
    //Will create a route called 'anotherRoute'
    anotherRoute : {
        pattern : "anotherPattern"
    }
}

{ viewType : "XML" }

{
    xmlTarget : {
        ...
    },
    jsTarget : {
        viewType : "JS"
        ...
    }
}

{
    xmlTarget : {
        viewType : "XML"
        ...
    },
    jsTarget : {
        viewType : "JS"
        ...
    }
}

Since the xmlTarget does not specify its viewType, XML is taken from the config object. The jsTarget is specifying it, so the viewType will be JS.

    new Router(
    // Routes
    [
        // Any route here
    ],
    {
        bypassed: {
            // you will find this name in the target config
            target: "notFound"
        }
    },
    // You should only use this constructor when you are not using a router with a component. Please use the metadata of a component to define your routes and targets. The documentation can be found here: sap.ui.core.UIComponent#.extend.
    null,
    // Target config
    {
         //same name as in the config.bypassed.target
         notFound: {
             viewName: "notFound",
             ...
             // more properties to place the view in the correct container
         }
    });

    new Router(
    // Routes
    [
        {
            // no view creation related properties are in the route
            name: "startRoute",
            //no hash
            pattern: "",
            // you can find this target in the targetConfig
            target: "welcome"
        }
    ],
    // Default values shared by routes and Targets
    {
        viewNamespace: "my.application.namespace",
        viewType: "XML"
    },
    // You should only use this constructor when you are not using a router with a component.
    // Please use the metadata of a component to define your routes and targets.
    // The documentation can be found here: sap.ui.core.UIComponent#.extend.
    null,
    // Target config
    {
         //same name as in the route called 'startRoute'
         welcome: {
             // All properties for creating and placing a view go here or in the config
             viewName: "Welcome",
             controlId: "app",
             controlAggregation: "pages"
         }
    })