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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弹出可以用alert，代码如下：<script>
window.alert("弹出层的内容")
</script>
希望对你有帮助，望采纳！
