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function onloadPreventer(fun) {
    if (window.location.hash != "#loaded") {
        //alert(window.location.hash);
        window.location = window.location + "#loaded";
        //alert(window.location.hash);
        fun;
    };
};

<body onload="onloadPreventer(anotherFunction(arg))">

function foo(){ /* ... */ } /* does NOT call foo */
function bar(){ /* ... */ } /* does NOT call bar */
foo;                        /* does NOT call foo */
foo(arg);         /* DOES call foo with arg as argument  */
foo(bar);         /* does NOT call bar, and DOES call foo with bar as argument */
foo(bar(arg));    /* DOES call bar with argument arg, and DOES call foo
                     with the returned value of bar as argument */

function onloadPreventer(fun) {
    if (location.hash !== (location.hash = "#loaded")) {
        fun(); // DOES call fun
    }
}

<body onload="onloadPreventer(
     function(){anotherFunction(arg);} /* does NOT call anotherFunction */
)">

function fun() {
    anotherFunction(arg);
}
document.body.onload = function onloadPreventer() {
    if (location.hash !== (location.hash = "#loaded")) {
        fun(); // DOES call fun
    }
};

<html><head>
<script type="text/javascript">
var callWhenNoHash = function() {
    console.log('called');
};
window.onload = function() {
    if (window.location.hash != '#hash') {
        callWhenNoHash();
    }
};
</script></head>
<body><a href="test2.html">test2</a></body>
</html>

<html><head></head><body>
<a href="test1.html#hash">test2</a>
</body></html>

$(window).load(function(){
  var load = "#loaded";
  if (window.location.hash != load) {
    window.location = window.location + load;
    document.write(load);
  };
})