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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示例如下：<input id="btnShow" type="button" value="点击" class="btn">
上面是一段按钮的html代码
如果要用原生的js来禁用这个按钮
可以用这样：
document.getElementByIdx_x_x("btnShow").disabled=true（这样就把按钮禁用了）
如果要重新开启按钮，则可以让disabled=false即可
那么在jquery下面要如何设置呢？其实也很简单
利用jquery的attr的方法即可
$("#btnShow").attr({"disabled":"disabled"})
如要让按钮恢复可用，可以采用removeAttr方法把disabled属性删除即可。
$("#btnShow").removeAttr("disabled")
