需要帮助破译JQuery示例吗
我刚开始学习jQuery和oojavascript，所以我试图弄清楚哪个属于哪个，它们做什么。我在JQuery文档中发现了这段代码需要帮助破译JQuery示例吗,jquery,Jquery,我刚开始学习jQuery和oojavascript，所以我试图弄清楚哪个属于哪个，它们做什么。我在JQuery文档中发现了这段代码 (function($sub) { $sub // a subclass of jQuery $sub === jQuery; //= false $sub.fn.myCustomMethod = function(){ return 'just for me'; } $sub(document).ready(function()
(function($sub) {
$sub // a subclass of jQuery
$sub === jQuery; //= false
$sub.fn.myCustomMethod = function(){
return 'just for me';
}
$sub(document).ready(function() {
$sub('body').myCustomMethod(); //= 'just for me'
});
})(jQuery.subclass());
function() {
}();
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jQuery.subclass// self invoking function. This creates a closure so that anything declared in
// this function is local and doesn't effect global state
(function($sub) {
$sub // a subclass of jQuery
$sub === jQuery; //= false
// here we extend $.fn with a new method. This actually extends the prototype of $sub
// $sub.fn === $sub.prototype === $()
// $sub.fn is actually a new jQuery object. This means that when using $sub we first look
// for method defined on $sub.fn, and if there aren't any we look on methods defined
// on $.fn. A useful feature of this is that you can overwrite methods
$sub.fn.myCustomMethod = function(){
return 'just for me';
}
// We can "overwrite" methods of jQuery by hiding the original methods.
$sub.fn.attr = function() {
alert("new attr!");
// you can go into $sub.superclass to get the original $ object and call methods there
$sub.superclass.attr.apply(this, arguments);
}
// This calls .ready from the original jQuery
$sub(document).ready(function() {
$sub('body').myCustomMethod(); //= 'just for me'
});
// we pass in a subclass of jquery at the bottom. This means that $sub has all the
// functionality of $ but doesn't change $ itself.
})(jQuery.subclass());
\uuuuu proto\uuuuuu函数dirty（$arg）{…}（function dirty（$arg）{…}）（“some arg”）；@Goleztroll从技术上讲，表达式返回调用函数的值，因为外圆括号在调用后结束。不，它不返回。括号中只包含函数声明。括号在函数结束后关闭。您的第1点是错误的。
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