之间有什么区别吗？
foo.bind(this)(arg1, arg2);
和
foo.bind(this, arg1, arg2)();
这两个代码在许多网站上运行正常，但在一个网站中，第二个示例因arg2为undefined而导致错误。
更新更复杂的例子
// Create an immediately invoked functional expression to wrap our code
(function () {
// Define our constructor
this.Widget = function (options) {
this.widgetWrap = null;
this.widgetHeaderTitle = null;
//Code removed for clarity
// Establish our default settings
this.options = extend({
formHeaders: ['Заголовок 1', 'Заголовок 2'],
}, options);
this.init();
};
// Public Methods
Widget.prototype.init = function () {
//Code removed for clarity
contentAnimation.bind(this)(this.widgetHeaderTitle, this.options.formHeaders);
//Not working on http://healthyclinic.ru/ but working on any other site
//this.options.formHeaders - Array with several elements. NOT NULL and NOT UNDEFINED
//contentAnimation.bind(this, this.widgetHeaderTitle, this.options.formHeaders)();
//Code removed for clarity
};
// Private Methods
function contentAnimation(el, arr) {
//In this place with second example 'arr' already UNDEFINED
var self = this;
var current = 1;
self.titleAnimationInterval = setInterval(function () {
el.style.opacity = 0;
setTimeout(function () {
el.textContent = arr[current];
el.style.opacity = 1;
current = ++current % arr.length;
}, self.options.transitionDuration);
}, 4000);
}
//Code removed for clarity
}());
在上面的代码中，您可以看到我的库中的代码。代码在许多站点和本地机器上都能正常工作，只有一个站点的第二个参数变为undefined。