{"id":805,"date":"2018-04-14T20:17:27","date_gmt":"2018-04-14T12:17:27","guid":{"rendered":"http:\/\/zouyang1230.com\/blog\/?p=805"},"modified":"2020-10-28T22:46:47","modified_gmt":"2020-10-28T14:46:47","slug":"js%e8%b6%a3%e7%8e%a9%ef%bc%9a%e4%bd%8d%e8%bf%90%e7%ae%97%e7%ac%a6%e5%ae%9e%e7%8e%b0js%e4%ba%8c%e8%bf%9b%e5%88%b6%e5%8a%a0%e6%b3%95%e5%87%8f%e6%b3%95js%e5%8a%a0%e5%87%8f%e6%b3%95","status":"publish","type":"post","link":"http:\/\/www.imzouyang.com\/blog\/archives\/805.html","title":{"rendered":"js\u8da3\u73a9\uff1a\u4f4d\u8fd0\u7b97\u7b26\u5b9e\u73b0js\u4e8c\u8fdb\u5236\u52a0\u6cd5\u51cf\u6cd5(js\u52a0\u51cf\u6cd5)"},"content":{"rendered":"

1\u3001\u672c\u6587\u7f18\u8d77<\/h4>\n

\u6628\u5929\u770b\u5230\u7fa4\u91cc\u6709\u670b\u53cb\u5728\u8ba8\u8bba\u8bf4\u201c\u5b9e\u73b0 js \u5c0f\u5b66\u6570\u5b66\u8fd0\u7b97\u641e\u7684\u5934\u5927\u201d\uff0c\u8bef\u4ee5\u4e3a\u4ed6\u662f\u8981\u5b9e\u73b0\u5e95\u5c42\u7b97\u6cd5\uff08\u540e\u9762\u53d1\u73b0\u53ea\u662f\u5b9e\u73b0\u5c0f\u5b66\u52a0\u51cf\u4e58\u9664\u8868\u76f8\u5173\u6570\u5b66 web \u529f\u80fd\uff0c\u53ef\u80fd\u662f\u9047\u5230js\u6570\u5b66\u8fd0\u7b97\u7684\u7cbe\u5ea6\u95ee\u9898\u4e86\u5427\uff09\uff0c\u53bb\u7f51\u4e0a\u641c\u4e86\u4e00\u5708\u53d1\u73b0\u5e76\u6ca1\u6709 javascript \u7684\u5e95\u5c42\u52a0\u51cf\u6cd5\u6587\u7ae0\u3002\u7d22\u6027\u81ea\u5df1\u5b9e\u73b0\u4e00\u4e2a\u4f8b\u5b50\uff0c\u8bb0\u5f55\u5982\u4e0b\u3002<\/p>\n

2\u3001\u9884\u5907\u77e5\u8bc6<\/h4>\n

\u539f\u7801<\/strong>\u3001\u53cd\u7801<\/strong>\u3001\u548c\u8865\u7801<\/strong>\u76f8\u4e92\u4e4b\u95f4\u7684\u5173\u7cfb\uff1a
\n1\uff09\u8ba1\u7b97\u673a\u5e95\u5c42\u7684\u8fd0\u7b97\u90fd\u662f 0\u30011 \u7684\u8fd0\u7b97\uff0c\u6570\u5b57\u6700\u7ec8\u90fd\u4f1a\u88ab\u8f6c\u6210\u4e8c\u8fdb\u5236\u76840\u548c1\u6765\u8fdb\u884c\u6570\u5b66\u8fd0\u7b97\u3002
\n2\uff093\u79cd\u4e8c\u8fdb\u5236\u7801\u5236\uff1a<\/p>\n

\u539f\u7801\uff1a\u5982\u679c\u673a\u5668\u5b57\u957f\u4e3a n\uff0c\u90a3\u4e48\u4e00\u4e2a\u6570\u7684\u539f\u7801\u5c31\u662f\u4e00\u4e2a n \u4f4d\u7684\u4e8c\u8fdb\u5236\u6709\u7b26\u53f7\u6570\uff0c\u5176\u4e2d\u6700\u9ad8\u4f4d\u4e3a\u7b26\u53f7\u4f4d\uff1a\u6b63\u6570\u4e3a 0\uff0c\u8d1f\u6570\u4e3a 1\u3002\u5269\u4e0b\u7684 n-1 \u4f4d\u4e3a\u6570\u503c\u4f4d\uff0c\u8868\u793a\u771f\u503c\u7684\u7edd\u5bf9\u503c\uff1b\u51e1\u4e0d\u8db3 n-1 \u4f4d\u7684\uff0c\u5728\u6700\u9ad8\u4f4d\u5de6\u8fb9\u52a0\u96f6\uff1b\u6574\u6570\u5219\u5728\u6700\u9ad8\u4f4d\u5de6\u8fb9\u52a0\u96f6\u6765\u8865\u8db3 n-1 \u4f4d\u3002
\n\u4f8b\u5982\uff1a8 \u4f4d\u673a\u5668\u4e0a\uff1aX = +101011\uff0c[X]\u539f = 0010 1011\uff1bX = -101011\uff0c[X]\u539f = 1010 1011<\/p>\n

\u53cd\u7801\uff1a\u6b63\u6570\u7684\u53cd\u7801\u4e0e\u5176\u539f\u7801\u76f8\u540c\uff1b
\n\u8d1f\u6570\u7684\u53cd\u7801\u662f\u5728\u539f\u7801\u7684\u57fa\u7840\u4e0a\uff0c\u7b26\u53f7\u4f4d\u4e0d\u53d8\uff0c\u5176\u4ed6\u4f4d\u6309\u4f4d\u53d6\u53cd\uff08\u5c31\u662f 0 \u53d8 1\uff0c1 \u53d8 0\uff09\u5c31\u53ef\u4ee5\u4e86\u3002
\n\u4f8b\u5982\uff1aX = -101011\uff0c[X]\u539f = 1010 1011\uff0c[X]\u53cd = 1101 0100<\/p>\n

\u8865\u7801\uff1a\u6b63\u6570\u7684\u8865\u7801\u4e0e\u5176\u539f\u7801\u76f8\u540c\uff1b
\n\u8d1f\u6570\u7684\u8865\u7801\u5c31\u662f\u5728\u53cd\u7801\u7684\u57fa\u7840\u4e0a\uff0c\u6309\u7167\u6b63\u5e38\u7684\u52a0\u6cd5\u8fd0\u7b97\u52a0 1\u3002
\n\u4f8b\u5982\uff1aX = -101011\uff0c[X]\u539f = 1010 1011 \uff0c[X]\u53cd = 1101 0100\uff0c[X]\u8865 = 1101 0101<\/p><\/blockquote>\n

\u9700\u8981\u7279\u522b\u8bf4\u660e\u7684\u662f\uff1a<\/p>\n

1\uff09\u539f\u7801\u4e0d\u80fd\u76f4\u63a5\u53c2\u52a0\u8fd0\u7b97\uff0c\u53ef\u80fd\u4f1a\u51fa\u9519\u3002\u4f8b\u5982\u6570\u5b66\u4e0a\uff0c1+(-1)=0\uff0c\u800c\u5728\u4e8c\u8fdb\u5236\u4e2d\uff1a
\n00000001+10000001=10000010\uff0c\u6362\u7b97\u6210\u5341\u8fdb\u5236\u4e3a -2\u3002\u663e\u7136\u662f\u9519\u8bef\u7684\u3002<\/p>\n

2\uff09\u800c\u8865\u7801\u53ef\u4ee5\u76f4\u63a5\u52a0\u51cf\u8fd0\u7b97\uff0c\u91c7\u7528\u8865\u7801\u52a0\u51cf\u6cd5\u8fd0\u7b97\uff0c\u53ef\u5c06\u201c\u6b63\u6570\u52a0\u8d1f\u6570\u201d\u7684\u64cd\u4f5c\uff0c\u8f6c\u5316\u4e3a\u201c\u6b63\u6570\u52a0\u6b63\u6570\u201d\u7684\u64cd\u4f5c\u3002\u6700\u540e\u628a\u5f97\u5230\u7684\u8865\u7801\u8fd0\u7b97\u7ed3\u679c\u53d6\u53cd\u7801\u7136\u540e\u8fd8\u539f\u4e3a\u539f\u7801\u5c31\u662f\u6b63\u786e\u7ed3\u679c\uff0c\u793a\u4f8b\uff1a
\n25+\uff08-36\uff09 = -11
\n25\u7684\u8865\u7801\uff1a00011001
\n-36\u7684\u8865\u7801\uff1a11011100
\n00011001
\n11011100
\n\u76f8\u52a0\u5f97\u5230\uff1a
\n11110101
\n11110101\u7684\u539f\u7801\u4e3a\uff1a10001011\uff08 \u5341\u8fdb\u5236\u5c31\u662f -11 \uff09<\/p><\/blockquote>\n

3\u3001js \u5b9e\u73b0\u52a0\u6cd5\uff1a<\/h4>\n
\nfunction Add(nNum1, nNum2) {\n    \/\/\u5982\u679c\u5176\u4e2d\u4e00\u4e2a\u76f8\u52a0\u53c2\u6570\u6570\u4e3a 0\uff0c\u5219\u8fd4\u56de\u53e6\u4e00\u53c2\u6570\uff1b\n    if(nNum1 == 0 || nNum2 == 0) return nNum1 || nNum2;\n    var ntempNum;\n    while (nNum2 != 0) {\n        ntempNum = nNum1 ^ nNum2;\n        nNum2 = (nNum1 & nNum2) << 1;\n        nNum1 = ntempNum;\n    }\n    return nNum1;\n}\n\nconsole.log( Add(5,7) ); \/\/12\nconsole.log( Add(11,21) ); \/\/32\n<\/code><\/pre>\n
\u4e0a\u4f8b console.log( Add(5,7) ); \u4e2d 5+7=12 \u8fd0\u7b97\u539f\u7406\u89e3\u91ca\uff1a
\n1\uff09\u9996\u5148\u770b\u5341\u8fdb\u5236<\/strong>\u662f\u5982\u4f55\u8fd0\u7b97\u7684\uff1a\uff08\u4e09\u6b65\u8d70\uff09<\/p>\n
\u7b2c\u4e00\u6b65\uff1a\u76f8\u52a0\u5404\u4f4d\u7684\u503c\uff0c\u4e0d\u7b97\u8fdb\u4f4d\uff0c\u5f97\u5230 2\uff1b
\n\u7b2c\u4e8c\u6b65\uff1a\u8ba1\u7b97\u8fdb\u4f4d\u503c\uff0c5+7 \u8fdb 10\uff0c\u5f97\u5230 10\uff08\u5982\u679c\u8fd9\u4e00\u6b65\u7684\u8fdb\u4f4d\u503c\u4e3a 0\uff0c\u90a3\u4e48\u7b2c\u4e00\u6b65\u5f97\u5230\u7684\u503c\u5c31\u662f\u6700\u7ec8\u7ed3\u679c\uff09\uff1b
\n\u7b2c\u4e09\u6b65\uff1a\u91cd\u590d\u4e0a\u8ff0\u4e24\u6b65\uff0c\u5c06\u8fdb\u4f4d\u503c\u4e0e\u4e2a\u4f4d\u503c\u76f8\u52a0\uff0c\u6240\u4ee5\u53ea\u662f\u76f8\u52a0\u7684\u503c\u53d8\u6210\u4e0a\u8ff0\u4e24\u6b65\u7684\u5f97\u5230\u7684\u7ed3\u679c 2 \u548c 10 \uff0c\u5f97\u5230 12\u3002<\/p><\/blockquote>\n
2\uff09\u518d\u6765\u770b\u4e8c\u8fdb\u5236<\/strong>\u503c\u76f8\u52a0\uff1a \uff08\u4e09\u6b65\u8d70\uff09<\/p>\n
\u9996\u5148\uff0c\u6570\u5b57 5 \u548c 7 \u8f6c\u6362\u4e3a8\u4f4d\u4e8c\u8fdb\u5236\uff1a
\n5 =< 0000 0101
\n7 =< 0000 0111<\/p>\n
\u7b2c\u4e00\u6b65\uff1a\u76f8\u52a0\u5404\u4f4d\u7684\u503c\uff0c\u4e0d\u7b97\u8fdb\u4f4d\uff0c
\n0000 0101
\n0000 0111
\n———-(\u76f8\u52a0\uff0c\u4f46\u4e0d\u7b97\u8fdb\u4f4d)
\n0000 0010
\n\u56e0\u4e3a\uff0c\u4e8c\u8fdb\u5236\u6bcf\u4f4d\u76f8\u52a0\u5c31\u76f8\u5f53\u4e8e\u5404\u4f4d\u505a\u5f02\u6216\u64cd\u4f5c^\uff08\u4e8c\u8fdb\u5236\u6570\u7684\u5f02\u6216\u64cd\u4f5c\u662f2\u4e2a\u6570\u5bf9\u5e94\u4f4d\u53ea\u6709\u4e00\u4e2a\u4e3a 1\uff0c\u5219\u5728\u8be5\u4f4d\u8fd4\u56de 1\uff0c\u5176\u5b83\u5747\u8fd4\u56de 0\uff0c\u6240\u4ee5\u5f02\u6216\u7684\u7ed3\u679c\u6b63\u662f\u6211\u4eec\u60f3\u8981\u7684\u5404\u4f4d\u76f8\u52a0\u4e0d\u7b97\u8fdb\u4f4d\u7684\u503c\uff1b\u5f53\u7136 js \u8fd8\u6709\u5176\u5b83\u8fdb\u5236\u5f62\u5f0f\u7684\u5f02\u6216\uff0c\u76f8\u5173\u77e5\u8bc6\u53e6\u6587\u8be6\u89e3\uff09
\n\u6240\u4ee5\uff0c00000101^00000111 \u5f97\u5230 00000010\uff0c\u8f6c\u4e3a\u5341\u8fdb\u5236\u5c31\u662f 2\uff0c\u6d4b\u8bd5\u5982\u4e0b\uff1a
\nconsole.log( 5^7 );
\n\u6253\u5370\u51fa 2<\/p>\n
\u7b2c\u4e8c\u6b65\uff1a\u8ba1\u7b97\u8fdb\u4f4d\u503c\uff0c\u8fd9\u91cc\u6211\u4eec\u5c06\u7528\u5230 &\u6309\u4f4d\u4e0e \u548c \u5de6\u79fb\u4f4d\u8fd0\u7b97\u7b26\u6765\u8ba1\u7b97\u8fdb\u4f4d\u503c\uff1a
\n& \u8fd0\u7b97\u7b26\uff1a2 \u4e2a\u6570\u5bf9\u5e94\u4f4d\u90fd\u662f1\uff0c\u5219\u5728\u8be5\u4f4d\u8fd4\u56de 1\uff1b
\n<< \u8fd0\u7b97\u7b26\uff1a\u5c06\u6570\u5f80\u5de6\u79fb\u52a8\u4e00\u4f4d\uff1b
\n\u9996\u5148 00000101 & 00000111 \u5f97\u5230 00000101\uff0c\u6240\u4ee52\u4e2a\u6570\u5bf9\u5e94\u4f4d\u90fd\u662f1\u7684\u4f1a\u5728\u8be5\u4f4d\u8fd4\u56de1\uff0c\u7406\u5e94\u5411\u4e0a\u8fdb 1 \u4f4d\u800c\u6ca1\u6709\u8fdb\u4f4d\u5374\u5728\u8be5\u4f4d\u8fd4\u56de 1\uff0c\u6240\u4ee5\u6211\u4eec\u5c31\u5c06\u5f97\u5230\u7684\u7ed3\u679c\u518d\u5de6\u79fb 1 \u4f4d\uff0c\u5373\u5f97\u5230\u8fdb\u4f4d\u503c\uff0c\u5f97\u5230 1010\uff0c\u4e8c\u8fdb\u5236\u7684 (101&111)<<1 \u5f97\u5230 1010
\n\u7b2c\u4e09\u6b65\u91cd\u590d\u4e0a\u8ff0\u4e24\u6b65\uff0c\u5c06\u5404\u4f4d\u503c\u4e0e\u8fdb\u4f4d\u503c\u76f8\u52a0\uff1b\u5148\u8ba1\u7b97\u5404\u4f4d\u503c\uff08\u4e0d\u7b97\u8fdb\u4f4d\uff09 00000010 ^ 00001010 = 00001000\uff0c\u8fdb\u4f4d\u503c\u4e3a (00000010 & 00001010)<<1 = 00000100
\n\u7ee7\u7eed while \u5faa\u73af\u91cd\u590d\u4e0a\u8ff0\u4e24\u6b65\uff1a00001000 ^ 00000100 = 00001100\uff0c\u76f4\u5230\u8fdb\u4f4d\u503c\u4e3a 0\uff0c\u8df3\u51fa\u5faa\u73af\uff0c\u8fd4\u56de 00001100 \u4e3a\u6700\u7ec8\u7ed3\u679c 12\u3002<\/p><\/blockquote>\n
4\u3001js \u5b9e\u73b0\u51cf\u6cd5<\/h4>\n
a-b \u7684\u51cf\u6cd5\u8fd0\u7b97\u53ef\u4ee5\u5229\u7528 a+(-b) \u6765\u5b9e\u73b0\uff0c\u5176\u4e2d b \u7684\u8d1f\u6570\u5c31\u662f -b\uff0c\u4e5f\u5c31\u662f b \u7684\u8865\u7801\uff0c\u5373 b \u9700\u8981\u8f6c\u8865\u7801\u540e\u4e0e a \u76f8\u52a0\uff1b
\n\u53c8\u56e0\u4e3a\u8865\u7801\u662f\u7531\u53cd\u7801\u52a01\u5f97\u5230\u7684\uff0c\u6240\u4ee5\u6211\u4eec\u5c31\u5148\u628a b \u8f6c\u53cd\u7801\uff0c\u7136\u540e\u518d\u52a01\uff08\u53cd\u7801\u5c31\u662f\u5404\u4f4d\u53d6\u53cd\uff0c\u4e5f\u5c31\u662f\u8981\u7528 ~\u6309\u4f4d\u53d6\u53cd\u8fd0\u7b97\u7b26\uff0c\u518d\u6700\u540e\u7ed3\u679c\u52a0\u4e0a 1\uff09\uff0c\u539f\u7406\u6211\u4eec\u77e5\u9053\uff0c\u5c31\u53ef\u4ee5\u5f00\u52a8\u4e86\uff1a<\/p>\n
\nfunction Sub(nNum1, nNum2) {\n    if(nNum1 == 0 || nNum2 == 0) return nNum1 || -nNum2 ;\n    nNum2 = ~nNum2;\t\/\/\u53d6\u53cd\u7801\n    var ntempNum;\n    while (nNum2 != 0) {\n        ntempNum = nNum1 ^ nNum2;\n        nNum2 = (nNum1 & nNum2) << 1;\n        nNum1 = ntempNum;\n    }\n    return nNum1+1;\n}\n\nconsole.log( Sub(5,18) ); \/\/-13\nconsole.log( Sub(160,18) ); \/\/142\n<\/code><\/pre>\n
\u4e0a\u4f8b\u5173\u952e\u70b9\u5c31\u662f \u53d6\u53cd\u7801 \u5904\u3002
\n(\u9898\u5916\u8bdd\uff0c\u5176\u5b9e \u52a0\u6cd5 Add() \u51fd\u6570\u7b2c\u4e8c\u4e2a\u53c2\u6570\u4f20\u5165\u8d1f\u503c\u65e2\u662f\u51cf\u6cd5\u64cd\u4f5c\u4e86\uff0c\u6bd4\u5982 console.log( Add(10,-20) ); \u6253\u5370\u51fa -10 \uff09<\/p>\n
\u81f3\u4e8e\u5176\u5b83\u8fd0\u7b97\uff0c\u539f\u7406\u5927\u81f4\u76f8\u4f3c\uff1a
\n\u4e58\u6cd5\uff1a\u5faa\u73af\u5229\u7528\u52a0\u6cd5\uff0c\u5b9e\u73b0b\u4e2aa\u76f8\u52a0
\n\u6574\u6570\u9664\u6cd5\uff1a\u5faa\u73af\u76f8\u51cf\uff0c\u76f4\u81f3\u51cf\u81f3\u975e\u6b63\u6570\u3002<\/p>\n
\u66f4\u591a\u4f4d\u8fd0\u7b97\u7b26\u7528\u4e8e\u63d0\u5347 js \u6027\u80fd\u7684\u8bb2\u89e3\u5c06\u5728\u53e6\u6587\u4ecb\u7ecd\uff0c\u6bd4\u5982 \u4f7f\u7528 & \u8fd0\u7b97\u7b26\u4f7f\u5f97\u53d6\u6a21\u6548\u7387\u63d0\u9ad850%\u3002\u79fb\u4f4d\u8fd0\u7b97\u7b26\u5728\u8ba1\u7b97\u4e2d\u9ad8\u6548\u8fd0\u7528\u4f7f\u6548\u7387\u7ffb\u500d\u7b49\u7b49\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
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