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This article mainly shares with you JS objects and data-related examples. JS is an object-based language, but it is not directly object-oriented because there are no classes. Hope it helps everyone.
1. Object
Basic definition of object: var obj=new Object(); or var obj={name:"xiaoming",sex:"man"} ;
var browser = { //对象是由花括号括起来的 name: "Firefox", kernel: "Gecko", run: function () { return "123"; } }; //通过点号(.)或“[]”来访问对象的属性 alert(browser.name + "==" + browser["name"]); //访问方法 alert(browser.run()); </script>
Global window object
JavaScript document object
JavaScript frames object
JavaScript history object
JavaScript location object
JavaScript navigator object
JavaScript screen object
Common methods
valueof() method: Returns the original value of the specified object
split() method splits the string into a string array and returns this array.
The indexOf() method returns the position of the first occurrence of a specified string value in the string.
The substring() method is used to extract characters between two specified subscripts in a string.
The substr() method extracts the specified number of strings starting from the startPos position from the string.
The join() method is used to put all elements in the array into a string.
arrayObject.join(separator)
reverse() method is used to reverse the order of elements in an array.
slice() method returns selected elements from an existing array
二、数组Array对象
基本定义:
var arr = [2, 3, 45, 6]; var arr1 = new Array(2, 4, 5, 7);//避免此种写法
//排序方法(升序) var arr = [11, 11, 2, 28, 4, 5, 1]; //不带参数按照字符编码的顺序 return [1, 11, 2, 28, 4, 5] alert(arr.sort()); //带参数 return [1, 2, 4, 5, 11, 28] //按照其他标准进行排序,就需要提供比较函数,该函数要比较两个值,然后返回一个用于说明这两个值的相对顺序的数字。 //比较函数应该具有两个参数 a 和 b //若 a 小于 b,在排序后的数组中 a 应该出现在 b 之前,则返回一个小于 0 的值。 //若 a 等于 b,则返回 0。 //若 a 大于 b,则返回一个大于 0 的值。 alert(arr.sort( function (a, b) { return a - b; }) );
DOM:
D理解为web加载网页文档;
O理为documnet的Object对象;
M模型理解为网页文档的模型结构;
DOM包含window
Window对象包含属性:document、location、navigator、screen、history、frames
Document根节点包含子节点:forms、location、anchors、images、links
事件类型:
鼠标事件:click、dbclick、mousedown、mouseup、mouseover、mouseout、mousemove
键盘事件:keydown、keypress、keyup
HTML事件:load、unload、abort、error、select、change、submit、reset、resize、scroll、focus、blur
HTML标签中事件处理器的语法是:
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document对象:
d
ocument对象:实际上是window对象的属性,document == window.document为true,是唯一一个既属于BOM又属于DOM的对象 document.lastModified //获取最后一次修改页面的日期的字符串表示 document.referrer //用于跟踪用户从哪里链接过来的 document.title //获取当前页面的标题,可读写 document.URL //获取当前页面的URL,可读写 document.anchors[0]或document.anchors["anchName"] //访问页面中所有的锚 document.forms[0]或document.forms["formName"] //访问页面中所有的表单 document.images[0]或document.images["imgName"] // 访问页面中所有的图像 document.links [0]或document.links["linkName"] //访问页面中所有的链接 document.applets [0]或document.applets["appletName"] //访问页面中所有的Applet document.embeds [0]或document.embeds["embedName"] //访问页面中所有的嵌入式对象 document.write(); 或document.writeln(); //将字符串插入到调用它们的位置
location对象:
location对象:表示载入窗口的URL,也可用window.location引用它 location.href //当前载入页面的完整URL,如http://www.somewhere.com/pictures/index.htm location.portocol //URL中使用的协议,即双斜杠之前的部分,如http location.host //服务器的名字,如www.wrox.com location.hostname //通常等于host,有时会省略前面的www location.port //URL声明的请求的端口,默认情况下,大多数URL没有端口信息,如8080 location.pathname //URL中主机名后的部分,如/pictures/index.htm location.search //执行GET请求的URL中的问号后的部分,又称查询字符串,如?param=xxxx location.hash //如果URL包含#,返回该符号之后的内容,如#anchor1 location.assign("http:www.baidu.com"); //同location.href,新地址都会被加到浏览器的历史栈中 location.replace("http:www.baidu.com"); //同assign(),但新地址不会被加到浏览器的历史栈中,不能通过back和forward访问 location.reload(true | false); //重新载入当前页面,为false时从浏览器缓存中重载,为true时从服务器端重载,默认为false
navigator对象
`
navigator`对象:包含大量有关Web浏览器的信息,在检测浏览器及操作系统上非常有用,也可用window.navigator引用它 `navigator.appCodeName` //浏览器代码名的字符串表示 navigator.appName //官方浏览器名的字符串表示 navigator.appVersion //浏览器版本信息的字符串表示 navigator.cookieEnabled //如果启用cookie返回true,否则返回false navigator.javaEnabled //如果启用java返回true,否则返回false navigator.platform //浏览器所在计算机平台的字符串表示 navigator.plugins //安装在浏览器中的插件数组 navigator.taintEnabled //如果启用了数据污点返回true,否则返回false navigator.userAgent //用户代理头的字符串表示
screen对象
screen对象:用于获取某些关于用户屏幕的信息,也可用window.screen引用它 screen.width/height //屏幕的宽度与高度,以像素计 screen.availWidth/availHeight //窗口可以使用的屏幕的宽度和高度,以像素计 screen.colorDepth //用户表示颜色的位数,大多数系统采用32位 window.moveTo(0, 0); window.resizeTo(screen.availWidth, screen.availHeight); //填充用户的屏幕
函数赋值:
<input type="button" value="按钮2" id="ben2"/> var btn2=document.getElementById('btn2');获得btn2按钮对象 //给btn2添加onclick属性,属性又触发了一个事件处理程序 btn2.onclick=function(){} //添加匿名函数 btn2.onclick=null //删除onclick属性
innerText、innerHTML、outerHTML、outerText:
innerText, innerHTML, outerHTML, outerText
innerText: Represents the text between the start tag and the end tag
innerHTML: Represents the HTML code of all elements and text of the element
For example: e388a4556c0f65e1904146cc1a846bee The innerText of a4b561c25d9afb9ac8dc4d70affff419Hello0d36329ec37a2cc24d42c7229b69747a world94b3e26ee717c64999d7867364b1b4a3 is Hello world, and innerHTML is Hello world
outerText: The difference from the former is that the entire target node is replaced, and the question returns the same content as innerText
outerHTML: The difference from the former is that it replaces the entire target node and returns the complete HTML code of the element, including the element itself
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