Sometimes I make a function and call the function later.
Example:
function example { alert(‘example‘); }
example(); // <-- Then call it later
Somehow, some functions cannot be called. I have to call those functions inside:
$(function() { });
What do $(function() {}); and (function() { }); mean, and what‘s the difference/purpose of these?
回答1
$(function() { ... });
is just jQuery short-hand for
$(document).ready(function() { ... });
What it‘s designed to do (amongst other things) is ensure that your function is called once all the DOM elements of the page are ready to be used.
However, I don‘t think that‘s the problem you‘re having - can you clarify what you mean by ‘Somehow, some functions are cannot be called and I have to call those function inside‘ ? Maybe post some code to show what‘s not working as expected ?
Edit: Re-reading your question, it could be that your function is running before the page has finished loaded, and therefore won‘t execute properly; putting it in $(function) would indeed fix that!
A page can‘t be manipulated safely until the document is "ready." jQuery detects this state of readiness for you. Code included inside $( document ).ready() will only run once the page Document Object Model (DOM) is ready for JavaScript code to execute. Code included inside $( window ).on( "load", function() { ... }) will run once the entire page (images or iframes), not just the DOM, is ready.
// A $( document ).ready() block. $( document ).ready(function() { console.log( "ready!" ); });
Experienced developers sometimes use the shorthand $() for $( document ).ready(). If you are writing code that people who aren‘t experienced with jQuery may see, it‘s best to use the long form.
// Shorthand for $( document ).ready() $(function() { console.log( "ready!" ); });
You can also pass a named function to $( document ).ready() instead of passing an anonymous function.
// Passing a named function instead of an anonymous function. function readyFn( jQuery ) { // Code to run when the document is ready. } $( document ).ready( readyFn ); // or: $( window ).on( "load", readyFn );
$(function () { $jQval.unobtrusive.parse(document); });
What does $(function() {} ); do?
原文：https://www.cnblogs.com/chucklu/p/14263298.html