1. Manipulate the attributes of elements:
①attr reads: ("selector").attr ("attribute name"); =>getAttribute ("attribute name"); change: ("selector").attr ("attribute name") "); =>getAttribute("attribute name"); change: ("selector").attr("attribute name", value); =>setAttribute("attribute name", value); * (* cannot be accessed anymore The prop attribute that exists in the start tag; for example: checked, selected, disabled);
② prop reads: ("selector").prop ("property name"); =>elem.property name; change: ("selector") .prop("property name"); =>elem.property name; change: ("selector").prop("property name", value);
③Remove attributes: $("selector").removeAttr( "Attribute name"); =>removeAttribute("Attribute name");
2. Content of the operation element:
①html original text: read: ("selector").html(); =>elem.innerHTML; change: ("selector").html(); =>elem.innerHTML; Change: ("selector").html("html fragment"); =>elem.innerHTML="html fragment"; Clear element: $("selector ").empty(); =>elem.innerHTML="";
②Plain text: read: ("selector").text(); =>elem.textContent/innerText; change: ("selector"). text(); =>elem.textContent/innerText; change: ("selector").text("text");
③The value of the form element: read: ("selector").val(); change: ( "selector").val(); change: ("selector").val(value);
3. Manipulate element styles:
① Directly manipulate CSS properties: ("selector").css("CSS properties name"); =>getComputedStyle(); ("selector").css("CSS property name"); =>getComputedStyle(); ("selector").css("CSS property name", value); => elem.style.CSS attribute name = value; modify multiple attribute values at the same time: $("selector").css({Attribute name 1: value 1, attribute name 2: value 2,...}); * (css ( ) can read all attributes, but can only modify inline styles, and attribute names must be de-hash-cased);
② Modify the class attribute: a. Complete modification: ("selector").attr("class"," class name"); b. Append: ("selector").attr("class","class name"); b. Append: ("selector").addClass("class name"); c. Remove: ("selector").removeClass("class name"); d. Clear: ("selector").removeClass("class name"); d. Clear: ("selector").attr("class","" ); or ("selector").removeClass(); e. Determine whether it contains: ("selector").removeClass(); e. Determine whether it contains: ("selector").hasClass("class name"); f , switch between with or without a specified class name: $("selector").toggleClass("class name");
4. Traverse nodes:
①Get the parent element: $("selector").parent( ); =>elem.parentNode; or elem.parentElement;
②Get sibling elements: next brother ("selector").next([selector]); =>elem.nextElementSibling; Previous brother: ("selector" ).next([selector]); =>elem.nextElementSibling; Previous brother: ("selector").prev([selector]); =>elem.previousElementSibling; Other brothers: $("selector").siblings( [selector]);
③Child element: direct child element: ("selector").children([selector]); all child elements: ("selector").children([selector]); all child elements ("selector").find(selector); * (find() must add selector);
5. Add:
①Create node: var elem=elem= ("Complete html element code segment");
②Add: append to the end of all child nodes under parent: (parent).append((parent).append(elem); insert as the first child node of parent: (parent).prepend((parent).prepend( elem); Insert after child: (child).after((child).after(elem); Insert before child: (child).before((child).before(elem);
6. Other operations:
①Delete: $(element to be deleted).remove();
②Replace: (old).replaceWith(new element); or (old).replaceWith(new element); or (new element).replaceAll (old);
③Copy: var clone=clone=(“selector”).clone([true]);* (true: includes event processing function for deep cloning);
7. Event binding bind:
①$(...).bind("Event name", fn)=>addEventListener; Bind multiple function objects to the event processing function of the same element;
②$(...).unbind("Event name", fn) =>removeEventListener; if it is possible to remove the event handler function, you must use a real-name function when binding, not an anonymous function; overload: a, without any parameters: remove all event handler function bindings on the element Define; b. With only one event name parameter: remove all function objects bound to the specified event name on the element; c. With two parameters: remove only the executed function objects bound to the specified event name on the event element;
8. Event binding delegate:
①Event proxy: Allow all qualified child elements under the specified parent element to use the event processing function (including generation); Principle: Use event bubbling: a. Only event processing The function is bound to the parent element; b. Get the target element: e.target; c. Only respond to events of elements that meet the conditions;
②Use of event proxy: Bind the event to the parent (using bubbling), only elements that meet the selector conditions can respond to the event; (parent).delegate("selector", "event name", function(e)e. target); remove binding: (parent).delegate("selector", "event name", function(e)e.target); remove binding: (parent).undelegate("selector", "event name" ", function(e){e.target});
9. Other bindings:
①One-time event: $(...).one("Event name", fn); The event processing function can only be executed once , automatically released after execution;
②Bind all events of the element to document: (...).live("event name", fn); (...).live("event name", fn); (...). die("event name", fn);
③Bind the event processing function to only one element: $("target").on("event name", fn);
④Use bubbling: $(" parent").on("event name", "selector", fn); unbind off;

实现方法:1、用“$("img").delay(毫秒数).fadeOut()”语句,delay()设置延迟秒数;2、用“setTimeout(function(){ $("img").hide(); },毫秒值);”语句,通过定时器来延迟。

修改方法:1、用css()设置新样式,语法“$(元素).css("min-height","新值")”;2、用attr(),通过设置style属性来添加新样式,语法“$(元素).attr("style","min-height:新值")”。

区别:1、axios是一个异步请求框架,用于封装底层的XMLHttpRequest,而jquery是一个JavaScript库,只是顺便封装了dom操作;2、axios是基于承诺对象的,可以用承诺对象中的方法,而jquery不基于承诺对象。

增加元素的方法:1、用append(),语法“$("body").append(新元素)”,可向body内部的末尾处增加元素;2、用prepend(),语法“$("body").prepend(新元素)”,可向body内部的开始处增加元素。

在jquery中,apply()方法用于改变this指向,使用另一个对象替换当前对象,是应用某一对象的一个方法,语法为“apply(thisobj,[argarray])”;参数argarray表示的是以数组的形式进行传递。

删除方法:1、用empty(),语法“$("div").empty();”,可删除所有子节点和内容;2、用children()和remove(),语法“$("div").children().remove();”,只删除子元素,不删除内容。

去掉方法:1、用“$(selector).removeAttr("readonly")”语句删除readonly属性;2、用“$(selector).attr("readonly",false)”将readonly属性的值设置为false。

on()方法有4个参数:1、第一个参数不可省略,规定要从被选元素添加的一个或多个事件或命名空间;2、第二个参数可省略,规定元素的事件处理程序;3、第三个参数可省略,规定传递到函数的额外数据;4、第四个参数可省略,规定当事件发生时运行的函数。


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