-
// inheriting from
-
//这里深复制一份options
-
basePrototype.options = $.widget.extend({}, basePrototype.options);
-
//在传入的ui原型中有方法调用this._super 和this.__superApply会调用到base上(最基类上)的方法
-
$.each(prototype, function(prop, value) {
-
//如果val不是function 则直接给对象赋值字符串
-
if (!$.isFunction(value)) {
-
proxiedPrototype[prop] = value;
-
return;
-
}
-
//如果val是function
-
proxiedPrototype[prop] = (function() {
-
//两种调用父类函数的方法
-
var _super = function() {
-
//将当期实例调用父类的方法
-
return base.prototype[prop].apply(this, arguments);
-
},
-
_superApply = function(args) {
-
return base.prototype[prop].apply(this, args);
-
};
-
return function() {
-
var __super = this._super,
-
__superApply = this._superApply,
-
returnValue;
-
// console.log(prop, value,this,this._super,‘===’)
-
// debugger;
-
//在这里调用父类的函数
-
this._super = _super;
-
this._superApply = _superApply;
-
returnValue = value.apply(this, arguments);
-
this._super = __super;
-
this._superApply = __superApply;
-
// console.log(this,value,returnValue,prop,‘===’)
-
return returnValue;
-
};
-
})();
-
});
-
// console.info(proxiedPrototype)
-
// debugger;
-
//这里是实例化获取的内容
-
constructor.prototype = $.widget.extend(basePrototype, {
-
// TODO: remove support for widgetEventPrefix
-
// always use the name + a colon as the prefix, e.g., draggable:start
-
// don’t prefix for widgets that aren’t DOM-based
-
widgetEventPrefix: existingConstructor ? (basePrototype.widgetEventPrefix || name) : name
-
}, proxiedPrototype, {
-
//重新把constructor指向 constructor 变量
-
constructor: constructor,
-
namespace: namespace,
-
widgetName: name,
-
widgetFullName: fullName
-
});
-
// If this widget is being redefined then we need to find all widgets that
-
// are inheriting from it and redefine all of them so that they inherit from
-
// the new version of this widget. We’re essentially trying to replace one
-
// level in the prototype chain.
-
//这里判定插件是否被使用了。一般来说,都不会被使用的。
-
//因为插件的开发者都是我们自己,呵呵
-
if (existingConstructor) {
-
$.each(existingConstructor._childConstructors, function(i, child) {
-
var childPrototype = child.prototype;
-
// redefine the child widget using the same prototype that was
-
// originally used, but inherit from the new version of the base
-
$.widget(childPrototype.namespace + “.” + childPrototype.widgetName, constructor, child._proto);
-
});
-
// remove the list of existing child constructors from the old constructor
-
// so the old child constructors can be garbage collected
-
delete existingConstructor._childConstructors;
-
} else {
-
//父类添加当前插件的实例 主要用于作用域链查找 不至于断层
-
base._childConstructors.push(constructor);
-
}
-
//将此方法挂在jQuery对象上
-
$.widget.bridge(name, constructor);
-
return constructor;
-
};
-
//扩展jq的extend方法,实际上类似$.extend(true,…) 深复制
-
$.widget.extend = function(target) {
-
var input = widget_slice.call(arguments, 1),
-
inputIndex = 0,
-
inputLength = input.length,
-
key, value;
-
for (; inputIndex < inputLength; inputIndex++) {
-
for (key in input[inputIndex]) {
-
value = input[inputIndex][key];
-
if (input[inputIndex].hasOwnProperty(key) && value !== undefined) {
-
// Clone objects
-
if ($.isPlainObject(value)) {
-
target[key] = KaTeX parse error: Undefined control sequence: \[ at position 22: …inObject(target\̲[̲key\]) ? .widget.extend({}, target[key], value) :
-
// Don’t extend strings, arrays, etc. with objects
-
$.widget.extend({}, value);
-
// Copy everything else by reference
-
} else {
-
target[key] = value;
-
}
-
}
-
}
-
}
-
return target;
-
};
-
//bridge 是设计模式的一种,这里将对象转为插件调用
-
$.widget.bridge = function(name, object) {
-
var fullName = object.prototype.widgetFullName || name;
-
//这里就是插件了
-
//这部分的实现主要做了几个工作,也是制作一个优雅的插件的主要代码
-
//1、初次实例化时将插件对象缓存在dom上,后续则可直接调用,避免在相同元素下widget的多实例化。简单的说,就是一个单例方法。
-
//2、合并用户提供的默认设置选项options
-
//3、可以通过调用插件时传递字符串来调用插件内的方法。如:$(‘#id’).menu(‘hide’) 实际就是实例插件并调用hide()方法。
-
//4、同时限制外部调用“_”下划线的私有方法
-
$.fn[name] = function(options) {
-
var isMethodCall = typeof options === “string”,
-
args = widget_slice.call(arguments, 1),
-
returnValue = this;
-
// allow multiple hashes to be passed on init.
-
//可以简单认为是$.extend(true,options,args[0],…),args可以是一个参数或是数组
-
options = !isMethodCall && args.length ? $.widget.extend.apply(null, [options].concat(args)) : options;
-
//这里对字符串和对象分别作处理
-
if (isMethodCall) {
-
this.each(function() {
-
var methodValue, instance = $.data(this, fullName);
-
//如果传递的是instance则将this返回。
-
if (options === “instance”) {
-
returnValue = instance;
-
return false;
-
}
-
if (!instance) {
-
return $.error("cannot call methods on " + name + " prior to initialization; " + “attempted to call method '” + options + “'”);
-
}
-
//这里对私有方法的调用做了限制,直接调用会抛出异常事件
-
if (!$.isFunction(instance[options]) || options.charAt(0) === “_”) {
-
return $.error(“no such method '” + options + “’ for " + name + " widget instance”);
-
}
-
//这里是如果传递的是字符串,则调用字符串方法,并传递对应的参数.
-
//比如插件有个方法hide(a,b); 有2个参数:a,b
-
//则调用时$(‘#id’).menu(‘hide’,1,2);//1和2 分别就是参数a和b了。
-
methodValue = instance[options].apply(instance, args);
-
if (methodValue !== instance && methodValue !== undefined) {
-
returnValue = methodValue && methodValue.jquery ? returnValue.pushStack(methodValue.get()) : methodValue;
-
return false;
-
}
-
});
-
} else {
-
this.each(function() {
-
var instance = $.data(this, fullName);
-
if (instance) {
-
instance.option(options || {});
-
//这里每次都调用init方法
-
if (instance._init) {
-
instance._init();
-
}
-
} else {
-
//缓存插件实例
-
$.data(this, fullName, new object(options, this));
-
}
-
});
-
}
-
return returnValue;
-
};
-
};
-
//这里是真正的widget基类
-
$.Widget = function( /* options, element */ ) {};
-
$.Widget._childConstructors = [];
-
$.Widget.prototype = {
-
widgetName: “widget”,
-
//用来决定事件的名称和插件提供的callbacks的关联。
-
// 比如dialog有一个close的callback,当close的callback被执行的时候,一个dialogclose的事件被触发。
-
// 事件的名称和事件的prefix+callback的名称。widgetEventPrefix 默认就是控件的名称,但是如果事件需要不同的名称也可以被重写。
-
// 比如一个用户开始拖拽一个元素,我们不想使用draggablestart作为事件的名称,我们想使用dragstart,所以我们可以重写事件的prefix。
-
// 如果callback的名称和事件的prefix相同,事件的名称将不会是prefix。
-
// 它阻止像dragdrag一样的事件名称。
-
widgetEventPrefix: “”,
-
defaultElement: “
”, -
//属性会在创建模块时被覆盖
-
options: {
-
disabled: false,
-
// callbacks
-
create: null
-
},
-
_createWidget: function(options, element) {
-
element = $(element || this.defaultElement || this)[0];
-
this.element = $(element);
-
this.uuid = widget_uuid++;
-
this.eventNamespace = “.” + this.widgetName + this.uuid;
-
this.options = $.widget.extend({}, this.options, this._getCreateOptions(), options);
-
this.bindings = $();
-
this.hoverable = $();
-
this.focusable = $();
-
if (element !== this) {
-
// debugger
-
$.data(element, this.widgetFullName, this);
-
this._on(true, this.element, {
-
remove: function(event) {
-
if (event.target === element) {
-
this.destroy();
-
}
-
}
-
});
-
this.document = $(element.style ?
-
// element within the document
-
element.ownerDocument :
-
// element is window or document
-
element.document || element);
-
this.window = $(this.document[0].defaultView || this.document[0].parentWindow);
-
}
-
this._create();
-
//创建插件时,有个create的回调
-
this._trigger(“create”, null, this._getCreateEventData());
-
this._init();
-
},
-
_getCreateOptions: $.noop,
-
_getCreateEventData: $.noop,
-
_create: $.noop,
-
_init: $.noop,
-
//销毁模块:去除绑定事件、去除数据、去除样式、属性
-
destroy: function() {
-
this._destroy();
-
// we can probably remove the unbind calls in 2.0
-
// all event bindings should go through this._on()
-
this.element.unbind(this.eventNamespace).removeData(this.widgetFullName)
-
// support: jquery <1.6.3
-
// http://bugs.jquery.com/ticket/9413
-
.removeData($.camelCase(this.widgetFullName));
-
this.widget().unbind(this.eventNamespace).removeAttr(“aria-disabled”).removeClass(
-
this.widgetFullName + "-disabled " + “ui-state-disabled”);
-
// clean up events and states
-
this.bindings.unbind(this.eventNamespace);
-
this.hoverable.removeClass(“ui-state-hover”);
-
this.focusable.removeClass(“ui-state-focus”);
-
},
-
_destroy: $.noop,
-
widget: function() {
-
return this.element;
-
},
-
//设置选项函数
-
option: function(key, value) {
-
var options = key,
-
parts, curOption, i;
-
if (arguments.length === 0) {
-
// don’t return a reference to the internal hash
-
//返回一个新的对象,不是内部数据的引用
-
return $.widget.extend({}, this.options);
-
}
-
if (typeof key === “string”) {
-
// handle nested keys, e.g., “foo.bar” => { foo: { bar: ___ } }
-
options = {};
-
parts = key.split(“.”);
-
key = parts.shift();
-
if (parts.length) {
-
curOption = options[key] = $.widget.extend({}, this.options[key]);
-
for (i = 0; i < parts.length - 1; i++) {
-
curOption[parts[i]] = curOption[parts[i]] || {};
-
curOption = curOption[parts[i]];
-
}
-
key = parts.pop();
-
if (arguments.length === 1) {
-
return curOption[key] === undefined ? null : curOption[key];
-
}
-
curOption[key] = value;
-
} else {
-
if (arguments.length === 1) {
-
return this.options[key] === undefined ? null : this.options[key];
-
}
-
options[key] = value;
-
}
-
}
-
this._setOptions(options);
-
return this;
-
},
-
_setOptions: function(options) {
-
var key;
-
for (key in options) {
-
this._setOption(key, options[key]);
-
}
-
return this;
-
},
-
_setOption: function(key, value) {
-
this.options[key] = value;
-
if (key === “disabled”) {
-
this.widget().toggleClass(this.widgetFullName + “-disabled”, !! value);
-
// If the widget is becoming disabled, then nothing is interactive
-
if (value) {
-
this.hoverable.removeClass(“ui-state-hover”);
-
this.focusable.removeClass(“ui-state-focus”);
-
}
-
}
-
return this;
-
},
-
enable: function() {
-
return this._setOptions({
-
disabled: false
-
});
-
},
-
disable: function() {
-
return this._setOptions({
-
disabled: true
-
});
-
},
-
_on: function(suppressDisabledCheck, element, handlers) {
-
var delegateElement, instance = this;
-
// no suppressDisabledCheck flag, shuffle arguments
-
if (typeof suppressDisabledCheck !== “boolean”) {
-
handlers = element;
-
element = suppressDisabledCheck;
-
suppressDisabledCheck = false;
-
}
-
// no element argument, shuffle and use this.element
-
if (!handlers) {
-
handlers = element;
-
element = this.element;
-
delegateElement = this.widget();
-
} else {
-
// accept selectors, DOM elements
-
element = delegateElement = $(element);
-
this.bindings = this.bindings.add(element);
-
}
-
$.each(handlers, function(event, handler) {
-
function handlerProxy() {
-
// allow widgets to customize the disabled handling
-
// - disabled as an array instead of boolean
-
// - disabled class as method for disabling individual parts
-
if (!suppressDisabledCheck && (instance.options.disabled === true || $(this).hasClass(“ui-state-disabled”))) {
-
return;
-
}
-
return (typeof handler === “string” ? instance[handler] : handler).apply(instance, arguments);
-
}
-
// copy the guid so direct unbinding works
-
if (typeof handler !== “string”) {
-
handlerProxy.guid = handler.guid = handler.guid || handlerProxy.guid || $.guid++;
-
}
-
var match = event.match(/^([\w:-]*)\s*(.*)$/),
-
eventName = match[1] + instance.eventNamespace,
-
selector = match[2];
-
if (selector) {
-
delegateElement.delegate(selector, eventName, handlerProxy);
-
} else {
-
element.bind(eventName, handlerProxy);
-
}
-
});
-
},
-
_off: function(element, eventName) {
-
eventName = (eventName || “”).split(" ").join(this.eventNamespace + " ") + this.eventNamespace;
-
element.unbind(eventName).undelegate(eventName);
-
},
-
_delay: function(handler, delay) {
-
function handlerProxy() {
-
return (typeof handler === “string” ? instance[handler] : handler).apply(instance, arguments);
-
}
-
var instance = this;
-
return setTimeout(handlerProxy, delay || 0);
-
},
-
_hoverable: function(element) {
-
this.hoverable = this.hoverable.add(element);
-
this._on(element, {
-
mouseenter: function(event) {
-
$(event.currentTarget).addClass(“ui-state-hover”);
-
},
-
mouseleave: function(event) {
-
$(event.currentTarget).removeClass(“ui-state-hover”);
-
}
-
});
-
},
-
_focusable: function(element) {
-
this.focusable = this.focusable.add(element);
-
this._on(element, {
-
focusin: function(event) {
-
$(event.currentTarget).addClass(“ui-state-focus”);
-
},
-
focusout: function(event) {
-
$(event.currentTarget).removeClass(“ui-state-focus”);
-
}
-
});
-
},
-
_trigger: function(type, event, data) {
-
var prop, orig, callback = this.options[type];
-
data = data || {};
-
event = $.Event(event);
-
event.type = (type === this.widgetEventPrefix ? type : this.widgetEventPrefix + type).toLowerCase();
-
// the original event may come from any element
-
// so we need to reset the target on the new event
-
event.target = this.element[0];
-
// copy original event properties over to the new event
-
orig = event.originalEvent;
-
if (orig) {
-
for (prop in orig) {
-
if (!(prop in event)) {
-
event[prop] = orig[prop];
-
}
-
}
-
}
-
this.element.trigger(event, data);
-
return !($.isFunction(callback) && callback.apply(this.element[0], [event].concat(data)) === false || event.isDefaultPrevented());
-
}
-
};
自我介绍一下,小编13年上海交大毕业,曾经在小公司待过,也去过华为、OPPO等大厂,18年进入阿里一直到现在。
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曾经在小公司待过,也去过华为、OPPO等大厂,18年进入阿里一直到现在。**
深知大多数前端工程师,想要提升技能,往往是自己摸索成长或者是报班学习,但对于培训机构动则几千的学费,着实压力不小。自己不成体系的自学效果低效又漫长,而且极易碰到天花板技术停滞不前!
因此收集整理了一份《2024年Web前端开发全套学习资料》,初衷也很简单,就是希望能够帮助到想自学提升又不知道该从何学起的朋友,同时减轻大家的负担。
[外链图片转存中…(img-NvH2wCRv-1711679238362)]
[外链图片转存中…(img-8Qzy8Hqi-1711679238362)]
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[外链图片转存中…(img-ORxydUkm-1711679238363)]
由于文件比较大,这里只是将部分目录截图出来,每个节点里面都包含大厂面经、学习笔记、源码讲义、实战项目、讲解视频,并且会持续更新!
如果你觉得这些内容对你有帮助,可以扫码获取!!(资料价值较高,非无偿)
最后
本人分享一下这次字节跳动、美团、头条等大厂的面试真题涉及到的知识点,以及我个人的学习方法、学习路线等,当然也整理了一些学习文档资料出来是附赠给大家的。知识点涉及比较全面,包括但不限于前端基础,HTML,CSS,JavaScript,Vue,ES6,HTTP,浏览器,算法等等
详细大厂面试题答案、学习笔记、学习视频等资料领取,点击资料领取直通车!!
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