Example parsing jQuery tool function-JS Tutorial-php.cn

Home

Web Front-end

JS Tutorial

Example parsing jQuery tool function

高洛峰

Dec 03, 2016 am 10:53 AM

jquery

1. $.browser object properties

Property list A Mozilla Mozilla related browsers return True, otherwise False will return to True, such as Firefox

Safari Safari related browsers, otherwise returning to False, such as Safari

Opera Opera related browsers, otherwise, return to False, As Operas msie Msie related browsers return True, otherwise returning false, such as IE, 360, Sogou

Version Return to the corresponding browser version

$(function () {
 if ($.browser.msie) {
 alert("IE浏览器");
 }
 if ($.browser.webkit) {
 alert("webkit浏览器");
 }
 if ($.browser.mozilla) {
 alert("mozilla浏览器");
 }
 if ($.browser.safari) {
 alert("safari浏览器");
 }
 if ($.browser.opera) {
 alert("opera浏览器");
 }
 alert($.browser.version);
})

Copy after login

2. Boxmodel

return a Boolean value, if it is W3C If the box model is used, it returns true, otherwise it returns false.

　 There are two types of box models, one is the W3C box model and the other is the IE box model. The fundamental difference between the two is that the W3C box model does not include padding and border, but only refers to the Height and Width of the content, while the IE box model includes padding and border.

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
 <title></title>
 <script src="jQuery.1.8.3.js" type="text/javascript"></script>
 <script type="text/javascript">
 $(function () {
  if ($.support.boxModel) {
  alert("W3C盒子模型!");
  }
  else {
  alert("IE盒子模型!");
  }
 })
 </script>
</head>
<body>
</body>
</html>

Copy after login

The above example pops up the W3C box model. If the top two lines are deleted, . What pops up is the IE box model.

Array and object operations

3. $.each()

This tool function can not only complete the traversal of the specified array, but also achieve the traversal of elements in the page.

Grammar: $.each(obj,fn(para1,para2)) obj is the array or object to be traversed, fn is the callback function executed for each traversed element, para1 represents the serial number of the array or the attribute of the object, and para2 represents the Properties of elements and objects.

$(function () {
  var arr = [1, 2, 3, 4, 5];
  $.each(arr, function (index, value) {
  document.write(index + ":");
  document.write(value + "<br/>");
  });
 })
　　　　输出：
　　　　　　0:1
　　　　　　1:2
　　　　　　2:3
　　　　　　3:4
　　　　　　4:5
   
　  $.each()遍历数组。

Copy after login

$(function () {
  var arr = { "张三": "23","李四": 22,"王五": "21" };
  $.each(arr, function (index, value) {
  document.write(index + ":");
  document.write(value + "<br/>");
  });
 })
　　　　输出：张三:23
　　　　　　　李四:22
　　　　　　 王五:21

Copy after login

Element traversal

<head>
 <title></title>
 <script src="jQuery.1.8.3.js" type="text/javascript"></script>
 <script type="text/javascript">
 $(function () {
  $("p").each(function () {
  $(this).css("background-color", "red");
  });
 
　　　　　　　//一下三行代码与以上三行效果一样
  //$.each($("p"), function () {
  // $(this).css("background-color", "red");
  //})
 })
 </script>
</head>
<body>
 <p>我是第一个P</p>
 <p>我是第二个P</p>
 <p>我是第三个P</p>
 <p>我是第四个P</p>
 <p>我是第五个P</p>
</body>
</html>

Copy after login

4. $.grep()

Filter elements that meet the conditions and return a new array

Syntax :$.grep(Arrar,fn(value ,index)); Pay attention to the order of the parameters of the callback function. The first one is the value, and the second one is the index.

　　　$.grep(Arrar,fn(value,index),[bool]); The third parameter indicates whether to invert, true means to invert, false means not to invert. If If the searched element exists in the array, the index of the searched element will be returned.

$(function () {
  var arr = [2, 5, 34, 22, 8];
  var arr1 = $.grep(arr, function(value, index) {
  return index <= 2 && value < 10;
  })
  document.write(arr1.join());　　//输出2,5
 })

Copy after login

　　　$.isArray(obj)　　Detect whether the parameter is an array

　　 $.isFunction(obj)　　　Detect whether the parameter is a function

　　 $.isEmptyObject(obj)　　Detect whether the parameter is an empty object

　　 $.isPlainObject(obj)　　Detect Whether the parameter is a pure object, that is, whether the object is created through {} or new Object() keyword.

　　$.contains(container,contained)　Detect whether a DOM node contains another DOM node. If yes, it returns true otherwise it means false. Note that the parameter is a DOM object, not a jQuery object.

$(function () {
  var arr = [2, 5, 34, 22, 8];
  var arr1 = $.map(arr, function (value, index) {
  if (value > 5 && index < 3) {
   return value - 10;
  }
  })
  document.write(arr.join() + "<br/>");　　//2,5,34,22,8　　可以看到原数组不改变
  document.write(arr1.join());　　　　　　　 //24　　新数组只获得了操作之后的结果
 })

Copy after login

10. $.param()

Serialized into url string

$(function () {
 var arr = [1, 2, 3, 4, 5];
 alert($.inArray(4,arr));　　//弹出 3
})

Copy after login

11. $.makeArray()

Copy the properties of the array or array-like object to a new array (really an array) and return the new array.

$(function () {
 var str = " 你在他乡还好吗？ ";
 document.write("11" + str + "11" + "<br/>");　　//输出 11 你在他乡还好吗？ 11
 document.write("11" + $.trim(str) + "11");　　　//输出 11你在他乡还好吗？11　　　　//加个11是为了看清楚差别。
})

Copy after login

12. $.merge()

This function accepts two arrays or array-like objects, appends the second parameter to the first parameter, returns the first parameter, and the first The first array will be modified, but the second one will not.

$(function () {
 var arr = [1, 2, 3, 2, 1];
 document.write(jQuery.isArray(arr));　　//返回true
 var str = "123";
 document.write(jQuery.isArray(str));　　//返回false
})
$(function () {
 var f = fun1;
 alert($.isFunction(fun1));　　//返回true
})
function fun1() { }
$(function () {
 var obj1 = {};
 var obj2 = { name: "张飞" };
 alert($.isEmptyObject(obj1));　　//返回true　　obj1是空对象
 alert($.isEmptyObject(obj2));　　//返回false　 obj2不是空对象
})
$(function () {
 var obj1 = {};
 var obj2 = { name: "张飞" };
 var obj3 = new Object();
 var obj4 = null;
 alert($.isPlainObject(obj1));　　//true　　通过{}创建
 alert($.isPlainObject(obj2));　　//true　　通过{}创建
 alert($.isPlainObject(obj3));　　//true　　通过new Object()创建
 alert($.isPlainObject(obj4));　　//flase　　不是通过{}或new Object()创建
})
$(function () {
 alert($.contains($("#div1")[0],$("#p1")[0]));　　//返回true，注意参数是DOM对象，并非jQuery对象
})

Copy after login

13. $.parseJSON()

This function will parse the string in JSON format and return the parsing result (object). Similar to JSON.parse(), note: jQuery only defines a JSON parsing function, not a serialization function.

$(function () {
 var man = { Name: "张飞", Age: 23 };
 var str = $.param(man);
 document.write(str);　　　　　　//Name=%E5%BC%A0%E9%A3%9E&Age=23
 var str1 = decodeURI(str);
 document.write("<br>" + str1);　　//Name=张飞&Age=23
})

Copy after login

14. $.proxy()

Similar to the bind() method of the Function object, it accepts the function as the first parameter, the object as the second parameter, and returns a new function, which The function is called as a method of the second parameter object.

var arr = [1,3,5,7,9];
$(function () {
 var arr1 = $.makeArray(arr);
 document.write(arr1.join());　　//输出 1,3,5,7,9
})

Copy after login

Fifteen, $.unique(array)

Delete duplicate elements in the element array

var arr1 = [1, 3, 5, 7, 9];
var arr2 = [2, 4, 6, 8, 10];
$(function () {
 var arr3 = $.merge(arr1, arr2);
 document.write(arr1.join() + "<br/>"); //1,3,5,7,9,2,4,6,8,10
 document.write(arr2.join() + "<br/>"); //2,4,6,8,10
 document.write(arr3.join() + "<br/>"); //1,3,5,7,9,2,4,6,8,10
})

Copy after login

　省略dest参数,extend方法原型中的dest参数是可以省略的，如果省略了，则该方法就只能有一个src参数，而且是将该src合并到调用extend方法的对象中去。

　　要特别注意的一点是：后面的值会覆盖前面同名的值。

$(function(){
 $.extend({
 hello:function(){alert(&#39;hello&#39;);}　　//该方法只有一个参数，意味着将hello方法合并到jQuery全局对象中去
 });
 $.hello(); //弹出 hello
})

Copy after login

　　命名空间示例：

$(function(){
 $.extend({net:{}}); //扩展一个命名空间
 $.extend($.net,{
 hello:function(){alert(&#39;hello&#39;);} //将hello方法绑定到命名空间net里去
 })
 $.net.hello(); //通过net命名空间调用方法
})

Copy after login

　拷贝方法原型：

extend(boolean,dest,src1,src2,src3...)

其中第一个参数boolean表示是否进行深层拷贝。

$(function(){
 var result=$.extend( true, {},
 { name: "John", location: {city: "Boston",country:"USA"} },
 { last: "Resig", location: {state: "MA",country:"China"} } );
 alert(result.location.state); //输出 MA
 //result={name:"John",last:"Resig", location:{city:"Boston",state:"MA",county:"China"}}
 var result=$.extend( false, {},
 { name: "John", location: {city: "Boston",country:"USA"} },
 { last: "Resig", location: {state: "MA",country:"China"} } );
 alert(result.location.city); //输出 undefined
 //result={name:"John",last:"Resig",location:{state:"MA",county:"China"}} 注意没有city，只是合并了location,location里面的属性不管
})

Copy after login

Statement of this Website

The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Hot AI Tools

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress images for free

Clothoff.io

AI clothes remover

Video Face Swap

Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Assassin's Creed Shadows: Seashell Riddle Solution

3 weeks ago By DDD

What's New in Windows 11 KB5054979 & How to Fix Update Issues

2 weeks ago By DDD

Where to find the Crane Control Keycard in Atomfall

3 weeks ago By DDD

Assassin's Creed Shadows - How To Find The Blacksmith And Unlock Weapon And Armour Customisation

4 weeks ago By DDD

Roblox: Dead Rails - How To Complete Every Challenge

3 weeks ago By DDD

Hot Tools

Notepad++7.3.1

Easy-to-use and free code editor

SublimeText3 Chinese version

Chinese version, very easy to use

Zend Studio 13.0.1

Powerful PHP integrated development environment

Dreamweaver CS6

Visual web development tools

SublimeText3 Mac version

God-level code editing software (SublimeText3)

Hot Topics

Where is the login entrance for gmail email?

7577

CakePHP Tutorial

1386

What is the format of the account name of steam

win11 activation key permanent

nyt connections hints and answers

111

Related knowledge

Detailed explanation of jQuery reference methods: Quick start guide Feb 27, 2024 pm 06:45 PM

Detailed explanation of jQuery reference method: Quick start guide jQuery is a popular JavaScript library that is widely used in website development. It simplifies JavaScript programming and provides developers with rich functions and features. This article will introduce jQuery's reference method in detail and provide specific code examples to help readers get started quickly. Introducing jQuery First, we need to introduce the jQuery library into the HTML file. It can be introduced through a CDN link or downloaded

How to use PUT request method in jQuery? Feb 28, 2024 pm 03:12 PM

How to use PUT request method in jQuery? In jQuery, the method of sending a PUT request is similar to sending other types of requests, but you need to pay attention to some details and parameter settings. PUT requests are typically used to update resources, such as updating data in a database or updating files on the server. The following is a specific code example using the PUT request method in jQuery. First, make sure you include the jQuery library file, then you can send a PUT request via: $.ajax({u

In-depth analysis: jQuery's advantages and disadvantages Feb 27, 2024 pm 05:18 PM

jQuery is a fast, small, feature-rich JavaScript library widely used in front-end development. Since its release in 2006, jQuery has become one of the tools of choice for many developers, but in practical applications, it also has some advantages and disadvantages. This article will deeply analyze the advantages and disadvantages of jQuery and illustrate it with specific code examples. Advantages: 1. Concise syntax jQuery's syntax design is concise and clear, which can greatly improve the readability and writing efficiency of the code. for example,

How to remove the height attribute of an element with jQuery? Feb 28, 2024 am 08:39 AM

How to remove the height attribute of an element with jQuery? In front-end development, we often encounter the need to manipulate the height attributes of elements. Sometimes, we may need to dynamically change the height of an element, and sometimes we need to remove the height attribute of an element. This article will introduce how to use jQuery to remove the height attribute of an element and provide specific code examples. Before using jQuery to operate the height attribute, we first need to understand the height attribute in CSS. The height attribute is used to set the height of an element

jQuery Tips: Quickly modify the text of all a tags on the page Feb 28, 2024 pm 09:06 PM

Title: jQuery Tips: Quickly modify the text of all a tags on the page In web development, we often need to modify and operate elements on the page. When using jQuery, sometimes you need to modify the text content of all a tags in the page at once, which can save time and energy. The following will introduce how to use jQuery to quickly modify the text of all a tags on the page, and give specific code examples. First, we need to introduce the jQuery library file and ensure that the following code is introduced into the page: &lt

Use jQuery to modify the text content of all a tags Feb 28, 2024 pm 05:42 PM

Title: Use jQuery to modify the text content of all a tags. jQuery is a popular JavaScript library that is widely used to handle DOM operations. In web development, we often encounter the need to modify the text content of the link tag (a tag) on the page. This article will explain how to use jQuery to achieve this goal, and provide specific code examples. First, we need to introduce the jQuery library into the page. Add the following code in the HTML file:

How to tell if a jQuery element has a specific attribute? Feb 29, 2024 am 09:03 AM

How to tell if a jQuery element has a specific attribute? When using jQuery to operate DOM elements, you often encounter situations where you need to determine whether an element has a specific attribute. In this case, we can easily implement this function with the help of the methods provided by jQuery. The following will introduce two commonly used methods to determine whether a jQuery element has specific attributes, and attach specific code examples. Method 1: Use the attr() method and typeof operator // to determine whether the element has a specific attribute

Understand the role and application scenarios of eq in jQuery Feb 28, 2024 pm 01:15 PM

jQuery is a popular JavaScript library that is widely used to handle DOM manipulation and event handling in web pages. In jQuery, the eq() method is used to select elements at a specified index position. The specific usage and application scenarios are as follows. In jQuery, the eq() method selects the element at a specified index position. Index positions start counting from 0, i.e. the index of the first element is 0, the index of the second element is 1, and so on. The syntax of the eq() method is as follows: $("s

See all articles