jquery - JavaScript closure problem, please advise?

Question

I need a function to be executed once by default, and can also be called in jquery events. I am currently stuck in the second step...

(function(){
    // 这样会自动运行一次
})()

$(window).resize(function () {
    // 我还想在这里调用上面那个函数
});

I tried this:

var demo = (function(){
    // 这样会自动运行一次
})()

结果第二次调用就报错了，说不是一个函数、、、求大神指教下如何实现？前提是我不想直接是这样：

var demo = function(){
    // 这样会自动运行一次
};

demo()

$(window).resize(function () {
    demo();
});

Answer 1

var demo = (function(){
    return arguments.callee
})()
或
var demo
;(demo = function(){})()

Answer 2

var demo = function test(){
    // 这样会自动运行一次
    return test
}();
$(window).resize(demo);

Try writing like this