超清晰的document对象详解_基础知识
时间：2021-07-01 10:21:17
帮助过：21人阅读
document 文挡对象 - JavaScript脚本语言描述
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对象属性
document.title //设置文档标题等价于HTML的
标签 <BR>document.bgColor //设置页面背景色 <BR>document.fgColor //设置前景色(文本颜色) <BR>document.linkColor //未点击过的链接颜色 <BR>document.alinkColor //激活链接(焦点在此链接上)的颜色 <BR>document.vlinkColor //已点击过的链接颜色 <BR>document.URL //设置URL属性从而在同一窗口打开另一网页 <BR>document.fileCreatedDate //文件建立日期，只读属性 <BR>document.fileModifiedDate //文件修改日期，只读属性 <BR>document.fileSize //文件大小，只读属性 <BR>document.cookie //设置和读出cookie <BR>document.charset //设置字符集 简体中文:gb2312 <BR>--------------------------------------------------------------------- <BR>对象方法 <BR>document.write() //动态向页面写入内容 <BR>document.createElement(Tag) //创建一个html标签对象 <BR>document.getElementById(ID) //获得指定ID值的对象 <BR>document.getElementsByName(Name) //获得指定Name值的对象 <BR>--------------------------------------------------------------------- <br><br>images集合(页面中的图象) <br><br>a)通过集合引用 <BR>document.images //对应页面上的<img>标签 <BR>document.images.length //对应页面上<img>标签的个数 <BR>document.images[0] //第1个<img>标签 <BR>document.images[i] //第i-1个<img>标签 <br><br>b)通过nane属性直接引用 <BR><img name="oImage"> <BR>document.images.oImage //document.images.name属性 <br><br>c)引用图片的src属性 <BR>document.images.oImage.src //document.images.name属性.src <br><br>d)创建一个图象 <BR>var oImage <BR>oImage = new Image() <BR>document.images.oImage.src="https://img.gxlcms.com/https://img.gxlcms.com//1.jpg" <BR>同时在页面上建立一个<img>标签与之对应就可以显示 <br><br><html> <BR><img name=oImage> <BR><script language="javascript"> <BR> var oImage <BR> oImage = new Image() <BR> document.images.oImage.src="https://img.gxlcms.com/https://img.gxlcms.com//1.jpg" <BR></ script> <BR></html> <br><br>---------------------------------------------------------------------- <br><br>forms集合(页面中的表单) <br><br>a)通过集合引用 <BR>document.forms //对应页面上的 <BR>document.Myform.myctrl //document.表单名.控件名 <br><br>----------------------------------------------------------------------- <BR><html> <BR><!--Text控件相关Script--> <BR> <br><br><script language="javascript"> <BR> //遍历select控件的option项 <BR> var length <BR> length=document.Myform.oSelect.length <BR> for(i=0;i<length;i++) <BR> document.write(document.Myform.oSelect[i].value) <BR></ script> <br><br><script language="javascript"> <BR> //遍历option项并且判断某个option是否被选中 <BR> for(i=0;i<document.Myform.oSelect.length;i++){ <BR> if(document.Myform.oSelect[i].selected!=true) <BR> document.write(document.Myform.oSelect[i].value) <BR> else <BR> document.write("<font color=red>"+document.Myform.oSelect[i].value+"</font>") <BR> } <BR></ script> <br><br><script language="javascript"> <BR> //根据SelectedIndex打印出选中的option <BR> //(0到document.Myform.oSelect.length-1) <BR> i=document.Myform.oSelect.selectedIndex <BR> document.write(document.Myform.oSelect[i].value) <BR></ script> <br><br><script language="javascript"> <BR> //动态增加select控件的option项 <BR> var oOption = document.createElement("OPTION"); <BR> oOption.text="4"; <BR> oOption.value="4"; <BR> document.Myform.oSelect.add(oOption); <BR></ script> <BR><html> <BR>----------------------------------------------------------------------- <BR><Div id="oDiv">Text</Div> <BR>document.all.oDiv //引用图层oDiv <BR>document.all.oDiv.style <BR>document.all.oDiv.style.display="" //图层设置为可视 <BR>document.all.oDiv.style.display="none" //图层设置为隐藏 <BR>/*document.all表示document中所有对象的集合 <BR>只有ie支持此属性，因此也用来判断浏览器的种类*/ </div>
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