srcmini在过去的几个月中, 针对Google Chrome浏览器发布了新的安全更新, 该更新实际上消除了直接使用JavaScript在浏览器中打开base64 URI的可能性。这到底意味着什么？对于开发人员, 如果你尝试使用JavaScript提供表示图像的base64字符串来打开新窗口, 则可以使用以下示例轻松地理解这一点：
window.open("data:image/png;base64, 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", "_blank");先前的JS代码的执行将在控制台中引发所提到的异常, 如果与_blank目标一起使用, 则会显示一个新的空白窗口, 但是其中没有内容, 并且在URL栏中仅包含about：blank。但是, 普通用户如果手动执行操作, 便可以复制base64字符串并在浏览器中将其打开。
简而言之, 除非你将base64数据URI手动粘贴到浏览器地址输入中, 否则无法再使用JavaScript动态地进行操作。
如何绕过JavaScript中的这个问题
通常, 开发人员使用这种直接在另一个窗口中打开base64 URL的方法来快速查看例如在Canvas中生成的图像的内容。如果需要执行相同的操作, 则可以通过在iframe中显示base64 URL来做到这一点！使用相同的window.open方法, 你可以简单地遵循以下示例：
/**
* Display a base64 URL inside an iframe in another window.
*/
function debugBase64(base64URL){
var win = window.open();
win.document.write('<iframe src="' + base64URL + '" frameborder="0" style="border:0; top:0px; left:0px; bottom:0px; right:0px; width:100%; height:100%;" allowfullscreen></iframe>');
}
// e.g This will open an image in a new window
debugBase64("data:image/png;base64, iVBORw0KGgoAAAANSUhEUgAAAZAAAAGQCAYAAACAvzbMAAAKkklEQVR4nO3dMW4cRxqGYfWaoZOFADnYRMAm4gGcSKkV2KDCPcFeYQGHS0eG4TPsBTY1YQZySiV7AAqOlDiQAMGJU6E3tERB9WO+YrF6Zp4nE1rT3TND80Vp5nct67qu9wBgR3+ZfQMA7CcBASAiIABEBASAiIAAEBEQACICAkBEQACICAgAEQEBICIgAEQEBICIgAAQERAAIgICQORk9g3AUMsy9vy20+GIWYEAEBEQACICAkBEQACICAgAEQEBICIgAESWdfVFdo7X8l37+HpujgQ+xQoEgIiAABAREAAiAgJAREAAiAgIABEBASBiPxAO2tK5H0jvFIgxKw6ZFQgAEQEBICIgAEQEBICIgAAQERAAIgICQMQcCFNdvHg59PzlHMYvxYYghde//9E8Xj2/s8ePuq4/+vWr9N4/+80KBICIgAAQERAAIgICQERAAIgICAARAQEgsqw2LGCiy2K/jndX10Ov/+Vv/+l6/P/+9s/m8bMnp83jl8X5q+d/+vBB8/j1qzfN48+K+6v49XHcrEAAiAgIABEBASAiIABEBASAiIAAEBEQACLmQJiqmgOpVHMS1RxG5aLz/NWcR6/q+X/W+fy/KY779XHcrEAAiAgIABEBASAiIABEBASAiIAAEBEQACIns2+A/VbNcXzdef7q8ZfFnMPr//6refyLv37ePF7NUVRzHr3Pvzp/75xHdX8/d52dQ2cFAkBEQACICAgAEQEBICIgAEQEBICIgAAQMQfCVL1zEr1e//5H8/jXz8/bJ3haHC+MniPpvr79PmiwAgEgIiAARAQEgIiAABAREAAiAgJAREAAiCzr6ovefFq130evcr+PzsdXLq6um8dPHz5oHr9+9aZ5/Gzj+4mU5/frgQYrEAAiAgJAREAAiAgIABEBASAiIABEBASAiDkQmi5evOx6/GfFHESl2o9i9JzKu8FzIr2vT8WcByNZgQAQERAAIgICQERAAIgICAARAQEgIiAARE5m3wD7rZyDKOYozh4/6rp+NSdyr5gTqfbLePa8fX8/PW3PyVSvz9+L61eq+zfnwUhWIABEBASAiIAAEBEQACICAkBEQACICAgAEXMgdPn86vvm8bN//HhHd5Kp9sv4+bw9R/LNvfacRfX4X4vrV8o5GBjICgSAiIAAEBEQACICAkBEQACICAgAEQEBILKsqy+SH7Vfvpt7/a/+PfT0S7EfSGV9fn47N/IJy9O+8/vPl5msQACICAgAEQEBICIgAEQEBICIgAAQERAAIuZA2LTLzjmOXtV+Ict5334g1fkvi+P2A2EmKxAAIgICQERAAIgICAARAQEgIiAARAQEgIg5EIba+hxHpZrzWIs5j0o159HLnAgjWYEAEBEQACICAkBEQACICAgAEQEBICIgAETMgdBn8pxHZfScxWi9cyz2E2EkKxAAIgICQERAAIgICAARAQEgIiAARAQEgIg5EPoUcyDlHELn5Wfvp1Htd1I9v977NyfCTFYgAEQEBICIgAAQERAAIgICQERAAIgICAARcyA0VXMOld45hV6z5xx650Rmm/36sW1WIABEBASAiIAAEBEQACICAkBEQACICAgAkZPZN8BcFy9etv/C1XXfBZ6cNg/37hey9TmFre8n8q73/eWoWYEAEBEQACICAkBEQACICAgAEQEBICIgAETMgdB0+vBB8/j1qzfN471zCveKOYqt76dR6Z5T6dyvpVK9/9Uc0dnjR7d5O2yMFQgAEQEBICIgAEQEBICIgAAQERAAIgICQGRZ18kbJjBU9T393jmPZ8V+H368tq3cD6bQ+/NjTmS/WYEAEBEQACICAkBEQACICAgAEQEBICIgAETMgey52XMeFT9e27YU+4n8dHXddX5zIofNCgSAiIAAEBEQACICAkBEQACICAgAEQEBIHIy+wYYy5wHLdX71zsnUv38sd+sQACICAgAEQEBICIgAEQEBICIgAAQERAAIuZADpw5D3qMnhNhv1mBABAREAAiAgJAREAAiAgIABEBASAiIABEzIFs3MWLl83j5jyYyZzIcbMCASAiIABEBASAiIAAEBEQACICAkBEQACImAOZrJrzOH34oOv85jyYqZrzqH6+qzkSP99zWYEAEBEQACICAkBEQACICAgAEQEBICIgAETMgQxWfY999vV9j56Rzh4/ah6v5qDYNisQACICAkBEQACICAgAEQEBICIgAEQEBIDIshoEACYZPSfl19tYViAARAQEgIiAABAREAAiAgJAREAAiAgIABH7gQDTmNPYb1YgAEQEBICIgAAQERAAIgICQERAAIgICAARAQEgIiAARAQEgIiAABAREAAiAgJAREAAiAgIABEBASAiIABEBASAiIAAEBEQACICAkBEQACICAgAEQEBICIgAEQEBICIgAAQOZl9A9ytZVlm38JRW9e1eXzf35/q+XFYrEAAiAgIABEBASDiM5Aj9/btk6Hnv3//auj1t37+6vGV3vPPfjyHzQoEgIiAABAREAAiPgOBO7Tvcx7wPisQACICAkBEQACI+AzkyG19DmDfzz/79YORrEAAiAgIABEBASDiM5AjM3o/ikPf7wL4kxUIABEBASAiIABEltUmxrzn5mcU67fF3//hwz/v+hlIdf7KzevfNPv8s++v0nv/H53Pr5OjYgUCQERAAIgICAARcyBwQGbP+XBcrEAAiAgIABEBASBiDoQPfDSnUf39G3/eeQ5kx/Pv6tjOP/r19+uC91mBABAREAAiAgJAxBwI3CH7pXBIrEAAiAgIABEBASDiMxA2bWtzFsCfrEAAiAgIABEBASAiIABEBASAiIAAEBEQACLmQGgaPQfh/Id9fg6bFQgAEQEBICIgAETsiQ5AxAoEgIiAABAREAAiAgJAREAAiAgIABEBASDi/4XVaVn2+/8mVI0BjX5+s6/PWL1jZrN//mizAgEgIiAARAQEgIjPQG7Z27dPhp7//v2rrutXj6/0Pr/R1x/9+mz9/d36+Xtt/f6OjRUIABEBASAiIABEfAZy5MxZMJKfr8NmBQJAREAAiAgIABGfgdyxrX8PffQcyb6bPYdTmX3+2XM63C0rEAAiAgJAREAAiPgMZOMOfb+Mrd//6Nf/0N9fDpsVCAARAQEgIiAARJbVpsBdbv4b9fpt5/l++PDPu/4beXX9m+e/afTjK6PPv+v1R7/+t33+yuz3r7K195c2KxAAIgICQERAAIgICAARAQEgIiAARAQEgIg5kE4ffU+/+vs7nn/nOYFbvv5H99P5+NHXr86/6+NHv/779v7e9ut722779afNCgSAiIAAEBEQACL2A5ls9r/Bzt6PYvb1gZwVCAARAQEgIiAARHwGwk565wAYa/YcRq/Zc0bsxgoEgIiAABAREAAiPgOhyZwG+2z2nNWhswIBICIgAEQEBICIz0Bu2exPBA79+r3n3/r97fv5Zz+eu2UFAkBEQACICAgAEXuiAxCxAgEgIiAARAQEgIiAABAREAAiAgJAREAAiAgIABEBASAiIABEBASAiIAAEBEQACICAkBEQACICAgAEQEBICIgAEQEBICIgAAQERAAIgICQERAAIgICAARAQEgIiAARAQEgMj/ARYVSURm9DRHAAAAAElFTkSuQmCC");这将打开一个带有iframe的新窗口, 该窗口将显示base64字符串, 就像在浏览器中正常显示的一样。有关此问题的更多信息, 请在此处的Google网上论坛中进行有趣的讨论。
编码愉快！
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