JavaScript的事件：onLoad
onLoadExecutes JavaScript code when a load event occurs; that is, when the browser finishes loading a window or all frames within a FRAMESET tag.
语法onLoad="handlerText"参数
描述Use the onLoad event handler within either the BODY or the FRAMESET tag, for example, <BODY onLoad="...">.In a FRAMESET and FRAME relationship, an onLoad event within a frame (placed in the BODY tag) occurs before an onLoad event within the FRAMESET (placed in the FRAMESET tag). For images, the onLoad event handler indicates the script to execute when an image is displayed. Do not confuse displaying an image with loading an image. You can load several images, then display them one by one in the same Image object by setting the object''s src property. If you change the image displayed in this way, onLoad executes every time an image is displayed, not just when the image is loaded into memory. If you specify an onLoad事件适用对象an Image object that displays a looping GIF animation (multi-image GIF), each loop of the animation triggers the onLoad event, and the event handler executes once for each loop. You can use the onLoad event handler to create a JavaScript animation by repeatedly setting the src property of an Image object. See Image for information.
使用的事件属性
示例示例 1: Display message when page loads. In the following example, the onLoad event handler displays a greeting message after a Web page is loaded.<BODY onLoad="window.alert("Welcome to the Brave New World home page!")> 示例 2: Display alert when image loads. The following example creates two Image objects, one with the Image constructor and one with the IMG tag. Each Image object has an onLoad event handler that calls the displayAlert function, which displays an alert. For the image created with the IMG tag, the alert displays the image name. For the image created with the Image constructor, the alert displays a messag |
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