javascript - How do you make an event listener that detects if a boolean variable becomes true? -

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for example, have var menu_ready = false;. have ajax function sets menu_ready true when ajax stuff done:

//set event listener here  $(...).load(..., function() {     ...     menu_ready = true; }

how set event listener waits menu_ready true?

one way continual polling:

function checkmenu() {     if (!menu_ready) {         settimeout("checkmenu();", 1000);         return;     } else {         // menu_ready true, need here.     } }

and...

<body onload="checkmenu();">

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