【正文】 相減，并保存在一個(gè)新的變量里，將會(huì)得到當(dāng)前到目標(biāo)日期之間的毫秒數(shù)。 其中一個(gè)需要設(shè)置為倒計(jì)時(shí)的目標(biāo)日期。請(qǐng)注意 if 后后面的條件是在括號(hào)里，并且雙等號(hào)用于比較。 每個(gè)函數(shù)的調(diào)用可以用于 語句來顯示結(jié)果。 日期 /時(shí)間戳讓用戶知道信息的發(fā)布時(shí)間，因此表明了其有效性。 下面的函數(shù)會(huì)在名為 myform的窗體中文本框 mymessagebox中產(chǎn)生一條滾動(dòng)消息。 onmouseout=src=39。 大連交通大學(xué) 2021 屆本科生畢業(yè)設(shè)計(jì)（論文）外文翻譯 12 作為鼠標(biāo)懸停的結(jié)果，任何應(yīng)用于特定對(duì)象的樣式屬性都可以被改變。 要同時(shí)顯示一項(xiàng)以上內(nèi)容（建立一個(gè)有垂直滾動(dòng)條的文本框），在選擇標(biāo)簽中包含尺寸參數(shù)。在鉆則標(biāo)簽中設(shè)置選項(xiàng)的值，指示要顯示新的一頁的 URL。 bordercolor : red} /style /head body form name=myform input type=button name=mybutton id=bigbutton value=CLICK ME! onclick==39。 color : blue。請(qǐng)注意，用簡(jiǎn)單的 type=button 來代替 type=submit。 請(qǐng)注意，所有屬性將在一對(duì)引號(hào)中列出，用逗號(hào)分割開。 對(duì)象名后使用一個(gè)逗點(diǎn)，后面可以是對(duì)象的動(dòng)作或者是對(duì)象可以被改變的屬性。 如果用戶點(diǎn)擊確定他們輸入的信息將存儲(chǔ)在變量中。 下面的語句會(huì)彈出一個(gè)對(duì)話框，需要回答是或否（確定或取消）。 警告框 為了 彈出一個(gè)警告框，可將下面一行代碼包含到你的 HTML 文件的 BODY 中的腳本標(biāo)簽里。函數(shù)是小的子程序，存儲(chǔ)于 HTML 文件的頭標(biāo)簽之間，當(dāng)一個(gè)特定的事件發(fā)生時(shí)將被調(diào)用執(zhí)行。s Day. var now = new Date var then = new Date(January 1, 2021) The variable now in the above example actually holds the number of milliseconds that have passed since the puter started counting until now. The variable then in the above example actually holds the number of milliseconds that will have passed between the time the puter started counting and January 1, 2021. By subracting the two amounts and storing the answer in a new variable you will know the number of milliseconds between now and your target date. With a little division, this number can be converted to the number of days between now and your target date. In order to display the result as an integer, you will need to use the function as in the following example which uses the variable numdays to hold the number of days to be displayed. Ceil is short for ceiling which implies that the number will be rounded up to the nearest whole number. (Only + (numdays) + days until New Year39。39。 height : 50px。大連交通大學(xué) 2021 屆本科生畢業(yè)設(shè)計(jì)（論文）外文翻譯 1 外文原文 Source: Web Page Design Using JavaScript THE BASICS JAVASCRIPT uses a subset of the programming language JAVA to provide a high level of interactivity on a web page. JavaScripts are stored within an HTML document and are interpreted by the web browser. JavaScripts may be located within the HTML code at the point in the page where they are to appear on the screen or they may be written using functions. Functions are small subprograms that are stored between the head tags of an HTML document and are called on to be executed when a particular event occurs. Whether the script is stored between the head tags or within the body of the HTML document, it must be enclosed in script tags. Also, a set of HTML ment tags are typically used inside the script tags so that older browsers that do not support JavaScript will ignore the script and continue to process the page without errors. Following is an example of the script and ment tags: script language=javascript ! Include JavaScript Code Here // /script Be aware that JavaScript is case sensitive...the difference between a working script and an error message can be one capital letter. ALERT BOXES To pop up an alert box include the following line of code inside of script tags in the body of your HTML document. Please note that the processing of the page will stop until the viewer responds to the alert box. alert (Place the text to be displayed in the alert box between these quotes.) Other types of premade dialog boxes are available such as the prompt and confirm boxes. In order to take full advantage of the features of these dialog boxes you must write more JavaScript code which can use the values that are returned by the dialog boxes. The following statements will pop up a dialog box that requires a yes or no answer (OK or Cancel). If the answer is OK then the variable named answer has a value of true and if th