图像、JS、CSS等内容，在短时间内浏览器不会每次访问都下载一次，以加快访问速度。
js是javascript是缩写，js是网页前台脚本，几乎所见的网页效果都是JS的功劳，如果没有JS网页将变得呆板。
准备的材料分别是：chrome浏览器、电脑。1、首先打开chrome浏览器，点击菜单上的“设置”按钮。
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2、其次，鼠标拉到底部，点击底部的“高级”按钮。
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3、接着，点击“网站设置”按钮。
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4、从弹出的面板，再再点击“JavaScript”菜单。
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5、最后将“允许（推荐）”按钮打开，之后刷新页面即可生效。
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