jquery自调用

var myModule = (function() {
    var privateVar = 'I am private';

    function privateMethod() {
        console.log(privateVar);
    }

    return {
        publicMethod: function() {
            privateMethod();
        },
        getPrivateVar: function() {
            return privateVar;
        }
    };
})();

console.log(myModule.getPrivateVar()); // 输出: I am private

(function($) {
    var context = this;
    $(document).ready(function() {
        console.log(context); // 这里的context指向window对象
    });
})(jQuery);

(function($) {
    $.fn.myPlugin = function(options) {
        var settings = $.extend({
            color: 'red',
            backgroundColor: 'yellow'
        }, options);

        return this.css({
            color: settings.color,
            backgroundColor: settings.backgroundColor
        });
    };
})(jQuery);

// 使用插件
$('p').myPlugin({
    color: 'blue',
    backgroundColor: 'green'
});