javascript difference handling

what best technique throwing exceptions thrown within javascript?

obviously, best technique try...catch. nonetheless ansynchronous callbacks forth, tricky.

i know ie gecko browsers support window.onerror, nonetheless show safari?

here garland test-cases i have executive difference doing fortitude for:

// errorhandler-test1
var exam = null;
test.arg = 5;
// errorhandler-test2
throw (new error("hello"));
// errorhandler-test3
throw "hello again";
// errorhandler-test4
throw {
    mymessage: "stuff",
    customproperty: 5,
    anarray: [1, 2, 3]
};
// errorhandler-test5
try {
    var test2 = null;
    test2.arg = 5;
} catch(e) {
    errorhandler.handleerror(e);
}
// errorhandler-test6
try {
    pitch (new error("goodbye"));
} catch(e) {
    errorhandler.handleerror(e);
}
// errorhandler-test7
try {
    pitch "goodbye again";
} catch(e) {
    errorhandler.handleerror(e);
}
// errorhandler-test8
try {
    pitch {
        mymessage: "stuff",
        customproperty: 5,
        anarray: [1, 2, 3]
    };
} catch(e) {
    errorhandler.handleerror(e);
}

if cruise any test-cases, greatfully plead them. several cases plead errorhandler.handleerror method. only suggested guideline controlling try...catch.