jsp页面上怎么用javascript获取base64编码的图片的大小 如何通过js将一base64编码的图片显示在html中
jsp\u9875\u9762\u4e0a\u600e\u4e48\u7528javascript\u83b7\u53d6base64\u7f16\u7801\u7684\u56fe\u7247\u7684\u5927\u5c0f\u5982\u56fe\uff0c\u7528js\u600e\u4e48\u83b7\u53d6\u8fd9\u79cd\u683c\u5f0f\u56fe\u7247\u7684\u5927\u5c0f\uff1fbase64\u7b80\u5355\u5730\u8bf4\uff0c\u5b83\u628a\u4e00\u4e9b 8-bit \u6570\u636e\u7ffb\u8bd1\u6210\u6807\u51c6 ASCII \u5b57\u7b26\uff0c\u6211\u4eec\u628a\u56fe\u50cf\u6587\u4ef6\u7684\u5185\u5bb9\u76f4\u63a5\u5199\u5728\u4e86HTML \u6587\u4ef6\u4e2d\uff0c\u8fd9\u6837\u505a\u7684\u597d\u5904\u662f\uff0c\u8282\u7701\u4e86\u4e00\u4e2aHTTP \u8bf7\u6c42
Data URI scheme\u3002
Data URI scheme\u662f\u5728RFC2397\u4e2d\u5b9a\u4e49\u7684\uff0c\u76ee\u7684\u662f\u5c06\u4e00\u4e9b\u5c0f\u7684\u6570\u636e\uff0c\u76f4\u63a5\u5d4c\u5165\u5230\u7f51\u9875\u4e2d\uff0c\u4ece\u800c\u4e0d\u7528\u518d\u4ece\u5916\u90e8\u6587\u4ef6\u8f7d\u5165\u3002\u6bd4\u5982\u4e0a\u9762\u90a3\u4e32\u5b57\u7b26\uff0c\u5176\u5b9e\u662f\u4e00\u5f20\u5c0f\u56fe\u7247\uff0c\u5c06\u8fd9\u4e9b\u5b57\u7b26\u590d\u5236\u9ecf\u8d34\u5230\u706b\u72d0\u7684\u5730\u5740\u680f\u4e2d\u5e76\u8f6c\u5230\uff0c\u5c31\u80fd\u770b\u5230\u5b83\u4e86\uff0c\u4e00\u5f202*2\u7684\u767d\u8272gif\u56fe\u7247\u3002
\u5728\u4e0a\u9762\u7684Data URI\u4e2d\uff0cdata\u8868\u793a\u53d6\u5f97\u6570\u636e\u7684\u534f\u5b9a\u540d\u79f0\uff0cimage/gif\u662f\u6570\u636e\u7c7b\u578b\u540d\u79f0\uff0cbase64 \u662f\u6570\u636e\u7684\u7f16\u7801\u65b9\u6cd5\uff0c\u9017\u53f7\u540e\u9762\u5c31\u662f\u8fd9\u4e2aimage/gif\u6587\u4ef6base64\u7f16\u7801\u540e\u7684\u6570\u636e\u3002
\u76ee\u524d\uff0cData URI scheme\u652f\u6301\u7684\u7c7b\u578b\u6709\uff1a
data:,\u6587\u672c\u6570\u636e
data:text/plain,\u6587\u672c\u6570\u636e
data:text/html,HTML\u4ee3\u7801
data:text/html;base64,base64\u7f16\u7801\u7684HTML\u4ee3\u7801
data:text/css,CSS\u4ee3\u7801
data:text/css;base64,base64\u7f16\u7801\u7684CSS\u4ee3\u7801
data:text/javascript,Javascript\u4ee3\u7801
data:text/javascript;base64,base64\u7f16\u7801\u7684Javascript\u4ee3\u7801
data:image/gif;base64,base64\u7f16\u7801\u7684gif\u56fe\u7247\u6570\u636e
data:image/png;base64,base64\u7f16\u7801\u7684png\u56fe\u7247\u6570\u636e
data:image/jpeg;base64,base64\u7f16\u7801\u7684jpeg\u56fe\u7247\u6570\u636e
data:image/x-icon;base64,base64\u7f16\u7801\u7684icon\u56fe\u7247\u6570\u636e
base64\u7b80\u5355\u5730\u8bf4\uff0c\u5b83\u628a\u4e00\u4e9b 8-bit \u6570\u636e\u7ffb\u8bd1\u6210\u6807\u51c6 ASCII \u5b57\u7b26\uff0c\u7f51\u4e0a\u6709\u5f88\u591a\u514d\u8d39\u7684base64 \u7f16\u7801\u548c\u89e3\u7801\u7684\u5de5\u5177\uff0c\u5728PHP\u4e2d\u53ef\u4ee5\u7528\u51fd\u6570base64_encode() \u8fdb\u884c\u7f16\u7801\uff0c\u5982echo base64_encode(file_get_contents(\u2018images/log.gif\u201d'));
\u76ee\u524d\uff0cIE8\u3001Firfox\u3001Chrome\u3001Opera\u6d4f\u89c8\u5668\u90fd\u652f\u6301\u8fd9\u79cd\u5c0f\u6587\u4ef6\u5d4c\u5165\u3002
\u4e3e\u4e2a\u56fe\u7247\u7684\u4f8b\u5b50\uff1a
\u7f51\u9875\u4e2d\u4e00\u5f20\u56fe\u7247\u53ef\u4ee5\u8fd9\u6837\u663e\u793a\uff1a
\u4ee3\u7801\u5982\u4e0b:
\u4e5f\u53ef\u4ee5\u8fd9\u6837\u663e\u793a\uff1a
\u4ee3\u7801\u5982\u4e0b:
\u6211\u4eec\u628a\u56fe\u50cf\u6587\u4ef6\u7684\u5185\u5bb9\u76f4\u63a5\u5199\u5728\u4e86HTML \u6587\u4ef6\u4e2d\uff0c\u8fd9\u6837\u505a\u7684\u597d\u5904\u662f\uff0c\u8282\u7701\u4e86\u4e00\u4e2aHTTP \u8bf7\u6c42\u3002\u574f\u5904\u5462\uff0c\u5c31\u662f\u6d4f\u89c8\u5668\u4e0d\u4f1a\u7f13\u5b58\u8fd9\u79cd\u56fe\u50cf\u3002
\u8981\u5b8c\u6210\u8fd9\u4e2a\u6548\u679c\uff0c\u6709\u4ee5\u4e0b\u51e0\u6b65\uff1a
\u5c06\u56fe\u7247\u8f6c\u5316\u4e3abase64\u7f16\u7801\u683c\u5f0f\u3002
\u8f93\u5165
var img = new Image();//\u521b\u5efaimg\u5bb9\u5668
img.src=\u2018\u8fd9\u513f\u5c31\u662f\u590d\u5236\u586b\u5199\u4e0a\u9762\u90a3\u4e00\u5927\u4e32\u2019\uff1b//\u7ed9img\u5bb9\u5668\u5f15\u5165base64\u7684\u56fe\u7247
3.\u6700\u540e\u4e00\u6b65\uff1a
document.body.appendChild(img)\uff1b//\u5c06img\u5bb9\u5668\u6dfb\u52a0\u5230html\u7684\u8282\u70b9\u4e2d\u5c31\u884c\u4e86\u3002
\u7b80\u4ecb\uff1a
JavaScript\u4e00\u79cd\u76f4\u8bd1\u5f0f\u811a\u672c\u8bed\u8a00\uff0c\u662f\u4e00\u79cd\u52a8\u6001\u7c7b\u578b\u3001\u5f31\u7c7b\u578b\u3001\u57fa\u4e8e\u539f\u578b\u7684\u8bed\u8a00\uff0c\u5185\u7f6e\u652f\u6301\u7c7b\u578b\u3002\u5b83\u7684\u89e3\u91ca\u5668\u88ab\u79f0\u4e3aJavaScript\u5f15\u64ce\uff0c\u4e3a\u6d4f\u89c8\u5668\u7684\u4e00\u90e8\u5206\uff0c\u5e7f\u6cdb\u7528\u4e8e\u5ba2\u6237\u7aef\u7684\u811a\u672c\u8bed\u8a00\uff0c\u6700\u65e9\u662f\u5728HTML\uff08\u6807\u51c6\u901a\u7528\u6807\u8bb0\u8bed\u8a00\u4e0b\u7684\u4e00\u4e2a\u5e94\u7528\uff09\u7f51\u9875\u4e0a\u4f7f\u7528\uff0c\u7528\u6765\u7ed9HTML\u7f51\u9875\u589e\u52a0\u52a8\u6001\u529f\u80fd\u3002
\u57281995\u5e74\u65f6\uff0c\u7531Netscape\u516c\u53f8\u7684Brendan Eich\uff0c\u5728\u7f51\u666f\u5bfc\u822a\u8005\u6d4f\u89c8\u5668\u4e0a\u9996\u6b21\u8bbe\u8ba1\u5b9e\u73b0\u800c\u6210\u3002\u56e0\u4e3aNetscape\u4e0eSun\u5408\u4f5c\uff0cNetscape\u7ba1\u7406\u5c42\u5e0c\u671b\u5b83\u5916\u89c2\u770b\u8d77\u6765\u50cfJava\uff0c\u56e0\u6b64\u53d6\u540d\u4e3aJavaScript\u3002\u4f46\u5b9e\u9645\u4e0a\u5b83\u7684\u8bed\u6cd5\u98ce\u683c\u4e0eSelf\u53caScheme\u8f83\u4e3a\u63a5\u8fd1\u3002
\u4e3a\u4e86\u53d6\u5f97\u6280\u672f\u4f18\u52bf\uff0c\u5fae\u8f6f\u63a8\u51fa\u4e86JScript\uff0cCEnvi\u63a8\u51faScriptEase\uff0c\u4e0eJavaScript\u540c\u6837\u53ef\u5728\u6d4f\u89c8\u5668\u4e0a\u8fd0\u884c\u3002\u4e3a\u4e86\u7edf\u4e00\u89c4\u683c\uff0c\u56e0\u4e3aJavaScript\u517c\u5bb9\u4e8eECMA\u6807\u51c6\uff0c\u56e0\u6b64\u4e5f\u79f0\u4e3aECMAScript\u3002
var img = new Image()
img.src = base64;（图片的base64编码字符串）
img.height即为图片的高度
img.width即为图片的宽度
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