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JS 参考

按类别分类的 JS 按字母顺序排列的 JS

JavaScript

JS 数组 JS 布尔值 JS 类 JS 日期 JS 错误 JS 全局 JS JSON JS 地图 JS 数学 JS 数字 JS 对象 JS 运算符 JS 优先级 JS Promise JS 正则表达式 JS 集合 JS 语句 JS 字符串 JS 类型化数组

窗口

窗口对象 窗口控制台 窗口历史记录 窗口位置 窗口导航器 窗口屏幕

HTML DOM

HTML 文档 HTML 元素 HTML 属性 HTML 集合 HTML 节点列表 HTML DOMTokenList HTML 样式
alignContent alignItems alignSelf animation animationDelay animationDirection animationDuration animationFillMode animationIterationCount animationName animationTimingFunction animationPlayState background backgroundAttachment backgroundClip backgroundColor backgroundImage backgroundOrigin backgroundPosition backgroundRepeat backgroundSize backfaceVisibility border borderBottom borderBottomColor borderBottomLeftRadius borderBottomRightRadius borderBottomStyle borderBottomWidth borderCollapse borderColor borderImage borderImageOutset borderImageRepeat borderImageSlice borderImageSource borderImageWidth borderLeft borderLeftColor borderLeftStyle borderLeftWidth borderRadius borderRight borderRightColor borderRightStyle borderRightWidth borderSpacing borderStyle borderTop borderTopColor borderTopLeftRadius borderTopRightRadius borderTopStyle borderTopWidth borderWidth bottom boxShadow boxSizing captionSide caretColor clear clip color columnCount columnFill columnGap columnRule columnRuleColor columnRuleStyle columnRuleWidth columns columnSpan columnWidth counterIncrement counterReset cssFloat cursor direction display emptyCells filter flex flexBasis flexDirection flexFlow flexGrow flexShrink flexWrap font fontFamily fontSize fontStyle fontVariant fontWeight fontSizeAdjust height isolation justifyContent left letterSpacing lineHeight listStyle listStyleImage listStylePosition listStyleType margin marginBottom marginLeft marginRight marginTop maxHeight maxWidth minHeight minWidth objectFit objectPosition opacity order orphans outline outlineColor outlineOffset outlineStyle outlineWidth overflow overflowX overflowY padding paddingBottom paddingLeft paddingRight paddingTop pageBreakAfter pageBreakBefore pageBreakInside perspective perspectiveOrigin position quotes resize right scrollBehavior tableLayout tabSize textAlign textAlignLast textDecoration textDecorationColor textDecorationLine textDecorationStyle textIndent textOverflow textShadow textTransform top transform transformOrigin transformStyle transition transitionProperty transitionDuration transitionTimingFunction transitionDelay unicodeBidi userSelect verticalAlign visibility width wordBreak wordSpacing wordWrap widows zIndex

HTML 事件

HTML 事件 HTML 事件对象 HTML 事件属性 HTML 事件方法

Web API

API Canvas API Console API Fetch API 全屏 API Geolocation API History API MediaQueryList API Storage API Validation API Web

HTML 对象

<a> <abbr> <address> <area> <article> <aside> <audio> <b> <base> <bdo> <blockquote> <body> <br> <button> <canvas> <caption> <cite> <code> <col> <colgroup> <datalist> <dd> <del> <details> <dfn> <dialog> <div> <dl> <dt> <em> <embed> <fieldset> <figcaption> <figure> <footer> <form> <head> <header> <h1> - <h6> <hr> <html> <i> <iframe> <img> <ins> <input> button <input> checkbox <input> color <input> date <input> datetime <input> datetime-local <input> email <input> file <input> hidden <input> image <input> month <input> number <input> password <input> radio <input> range <input> reset <input> search <input> submit <input> text <input> time <input> url <input> week <kbd> <label> <legend> <li> <link> <map> <mark> <menu> <menuitem> <meta> <meter> <nav> <object> <ol> <optgroup> <option> <output> <p> <param> <pre> <progress> <q> <s> <samp> <script> <section> <select> <small> <source> <span> <strong> <style> <sub> <summary> <sup> <table> <tbody> <td> <tfoot> <th> <thead> <tr> <textarea> <time> <title> <track> <u> <ul> <var> <video>

其他参考

CSSStyleDeclaration JS 转换


Style borderTop 属性

示例

为 <div> 元素添加顶部边框

document.getElementById("myDiv").style.borderTop = "thick solid #0000FF";
自己尝试 »

描述

borderTop 属性以简写形式设置或返回最多三个单独的 border-top 属性。

使用此属性,您可以设置/返回以下一个或多个属性(以任何顺序):

  • border-top-width
  • border-top-style
  • border-top-color

浏览器支持

属性
borderTop

语法

返回 borderTop 属性

object.style.borderTop

设置 borderTop 属性

object.style.borderTop = "width style color|initial|inherit"

属性值

参数 描述
width 设置顶部边框的宽度
style 设置顶部边框的样式
color 设置顶部边框的颜色
initial 将此属性设置为其默认值。 了解有关 initial 的信息
inherit 从其父元素继承此属性。 了解有关 inherit 的信息


技术细节

默认值 未指定
返回值 字符串,表示元素顶部边框的宽度、样式和/或颜色
CSS 版本 CSS1

更多示例

示例

更改 <div> 元素顶部边框的宽度、样式和颜色

document.getElementById("myDiv").style.borderTop = "thin dotted red";
自己尝试 »

示例

返回 <div> 元素的 border-top 属性值

alert(document.getElementById("myDiv").style.borderTop);
自己尝试 »

相关页面

CSS 教程: CSS 边框

CSS 参考: border-top 属性

HTML DOM 参考: border 属性


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