javascript - How does the load() function allow the user to provide a callback? -
in javascript it's popular libraries/frameworks let define callback function post-processing of data.
eg.
load("5", function(element) { alert(element.name); });
i wonder how load() function looks able let user provide callback?
are there tutorials this?
well, load
function this:
function load(arg, callback) { var element = { name: "foo " + arg }; // pass if (typeof callback == 'function') { callback(element); } }
with typeof
check make sure callback argument object can invoke, function.
then example:
load("5", function(element) { alert(element.name); // show `"foo 5"`. });
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