{"id":6184,"date":"2024-02-01T11:29:43","date_gmt":"2024-02-01T03:29:43","guid":{"rendered":"https:\/\/www.citerp.com.tw\/citwordpress\/?p=6184"},"modified":"2024-02-01T11:29:45","modified_gmt":"2024-02-01T03:29:45","slug":"javascript-%e5%b8%b8%e7%94%a8%e9%81%8b%e7%ae%97%e5%ad%90","status":"publish","type":"post","link":"https:\/\/www.citerp.com.tw\/citwordpress\/javascript-%e5%b8%b8%e7%94%a8%e9%81%8b%e7%ae%97%e5%ad%90\/","title":{"rendered":"JavaScript \u5e38\u7528\u904b\u7b97\u5b50"},"content":{"rendered":"\n

\u8ce6\u503c\u904b\u7b97\u5b50<\/a><\/h2>\n\n\n\n
\u540d\u7a31<\/th>\u7c21\u5316\u7684\u904b\u7b97\u5b50<\/th>\u610f\u7fa9<\/th><\/tr><\/thead>
\u8ce6\u503c\u00a0(en-US)<\/small><\/a><\/td>x = y<\/code><\/td>x = y<\/code><\/td><\/tr>
\u52a0\u6cd5\u00a0(en-US)<\/small><\/a>\u8ce6\u503c\u00a0(en-US)<\/small><\/a><\/td>x += y<\/code><\/td>x = x + y<\/code><\/td><\/tr>
\u6e1b\u6cd5\u00a0(en-US)<\/small><\/a>\u8ce6\u503c\u00a0(en-US)<\/small><\/a><\/td>x -= y<\/code><\/td>x = x - y<\/code><\/td><\/tr>
\u4e58\u6cd5\u00a0(en-US)<\/small><\/a>\u8ce6\u503c\u00a0(en-US)<\/small><\/a><\/td>x *= y<\/code><\/td>x = x * y<\/code><\/td><\/tr>
\u9664\u6cd5\u00a0(en-US)<\/small><\/a>\u8ce6\u503c\u00a0(en-US)<\/small><\/a><\/td>x \/= y<\/code><\/td>x = x \/ y<\/code><\/td><\/tr>
\u9918\u6578\u00a0(en-US)<\/small><\/a>\u8ce6\u503c\u00a0(en-US)<\/small><\/a><\/td>x %= y<\/code><\/td>x = x % y<\/code><\/td><\/tr>
\u6307\u6578\u00a0(en-US)<\/small><\/a>\u8ce6\u503c\u00a0(en-US)<\/small><\/a><\/td>x **= y<\/code><\/td>x = x ** y<\/code><\/td><\/tr>
\u5de6\u79fb\u8ce6\u503c\u00a0(en-US)<\/small><\/a><\/td>x <<= y<\/code><\/td>x = x << y<\/code><\/td><\/tr>
\u53f3\u79fb\u8ce6\u503c\u00a0(en-US)<\/small><\/a><\/td>x >>= y<\/code><\/td>x = x >> y<\/code><\/td><\/tr>
\u7121\u865f\u53f3\u79fb\u8ce6\u503c\u00a0(en-US)<\/small><\/a><\/td>x >>>= y<\/code><\/td>x = x >>> y<\/code><\/td><\/tr>
\u4f4d\u5143 AND \u8ce6\u503c\u00a0(en-US)<\/small><\/a><\/td>x &= y<\/code><\/td>x = x & y<\/code><\/td><\/tr>
\u4f4d\u5143 XOR \u8ce6\u503c<\/a>\u00a0(en-US)<\/small><\/a><\/td>x ^= y<\/code><\/td>x = x ^ y<\/code><\/td><\/tr>
\u4f4d\u5143 OR \u8ce6\u503c\u00a0(en-US)<\/small><\/a><\/td>x |= y<\/code><\/td>x = x | y<\/code><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

\u6bd4\u8f03\u904b\u7b97\u5b50<\/a><\/h2>\n\n\n\n
\u904b\u7b97\u5b50<\/th>\u63cf\u8ff0<\/th>\u6703\u56de\u50b3 True \u7684\u4f8b\u5b50<\/th><\/tr><\/thead>
\u7b49\u65bc\u00a0(en-US)<\/small><\/a>\u00a0(==<\/code>)<\/td>\u5047\u5982\u904b\u7b97\u5143\u7b49\u50f9\u5c31\u56de\u50b3 True\u3002<\/td>3 == var1<\/code> \"3\" == var1<\/code> 3 == '3'<\/code><\/td><\/tr>
\u4e0d\u7b49\u65bc\u00a0(en-US)<\/small><\/a>\u00a0(!=<\/code>)<\/td>\u5047\u5982\u904b\u7b97\u5143\u7b49\u50f9\u5c31\u56de\u50b3 True\u3002<\/td>var1 != 4 var2 != \"3\"<\/code><\/td><\/tr>
\u56b4\u683c\u7b49\u65bc\u00a0(en-US)<\/small><\/a>\u00a0(===<\/code>)<\/td>\u5047\u5982\u904b\u7b97\u5143\u5177\u6709\u76f8\u540c\u578b\u614b\u4e14\u7b49\u50f9\u5247\u56de\u50b3 True\u3002\u53c3\u8003\u00a0Object.is<\/code>\u00a0(en-US)<\/small><\/a>\u00a0\u53ca\u00a0JS \u4e2d\u7684\u7b49\u50f9\u6027<\/a>\u3002<\/td>3 === var1<\/code><\/td><\/tr>
\u56b4\u683c\u4e0d\u7b49\u65bc\u00a0(en-US)<\/small><\/a>\u00a0(!==<\/code>)<\/td>\u5047\u5982\u904b\u7b97\u5143\u5177\u6709\u76f8\u540c\u578b\u614b\u4f46\u4e0d\u7b49\u50f9\uff0c\u6216\u662f\u5177\u6709\u4e0d\u540c\u578b\u614b\uff0c\u56de\u50b3 True\u3002<\/td>var1 !== \"3\" 3 !== '3'<\/code><\/td><\/tr>
\u5927\u65bc\u00a0(en-U<\/small><\/a>S)<\/small><\/a>\u00a0(><\/code>)<\/td>\u5047\u5982\u5de6\u65b9\u904b\u7b97\u5143\u5927\u65bc\u53f3\u65b9\u904b\u7b97\u5143\uff0c\u56de\u50b3 True\u3002<\/td>var2 > var1 \"12\" > 2<\/code><\/td><\/tr>
\u5927\u65bc\u6216\u7b49\u65bc\u00a0(en-US)<\/small><\/a>\u00a0(>=<\/code>)<\/td>\u5047\u5982\u5de6\u65b9\u904b\u7b97\u5143\u5927\u65bc\u6216\u7b49\u65bc\u53f3\u65b9\u904b\u7b97\u5143\uff0c\u56de\u50b3 True\u3002<\/td>var2 >= var1 var1 >= 3<\/code><\/td><\/tr>
\u5c0f\u65bc\u00a0(en-US)<\/small><\/a>\u00a0(<<\/code>)<\/td>\u5047\u5982\u5de6\u65b9\u904b\u7b97\u5143\u5c0f\u65bc\u53f3\u65b9\u904b\u7b97\u5143\uff0c\u56de\u50b3 True\u3002<\/td>var1 < var2 \"2\" < 12<\/code><\/td><\/tr>
\u5c0f\u65bc\u6216\u7b49\u65bc\u00a0(en-US)<\/small><\/a>\u00a0(<=<\/code>)<\/td>\u5047\u5982\u5de6\u65b9\u904b\u7b97\u5143\u5c0f\u65bc\u6216\u7b49\u65bc\u53f3\u65b9\u904b\u7b97\u5143\uff0c\u56de\u50b3 True\u3002<\/td>var1 <= var2 var2 <= 5<\/code><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

\u7b97\u8853\u904b\u7b97\u5b50<\/a><\/h2>\n\n\n\n
\u904b\u7b97\u5b50<\/th>\u63cf\u8ff0<\/th>\u7bc4\u4f8b<\/th><\/tr><\/thead>
\u53d6\u9918\u6578\u00a0(en-US)<\/small><\/a>\u00a0(%<\/code>)<\/td>\u4e8c\u5143\u904b\u7b97\u5b50\u3002\u56de\u50b3\u5169\u500b\u904b\u7b97\u5143\u76f8\u9664\u5f8c\u7684\u9918\u6578\u3002<\/td>12 % 5 \u56de\u50b3 2.<\/td><\/tr>
\u589e\u52a0\u00a0(en-US)<\/small><\/a>\u00a0(++<\/code>)<\/td>\u4e00\u5143\u904b\u7b97\u5b50\u3002 \u5c07\u904b\u7b97\u5143\u589e\u52a0 1\u3002\u5047\u5982\u4f7f\u7528\u5728\u904b\u7b97\u5143\u4e4b\u524d (++x<\/code>)\uff0c\u6703\u904b\u7b97\u5143\u56de\u50b3\u589e\u52a0 1 \u5f8c\u7684\u503c;\u5047\u5982\u4f7f\u7528\u5728\u904b\u7b97\u5143\u4e4b\u5f8c\u3002 (x++<\/code>)\uff0c<\/code> \u6703\u56de\u50b3\u904b\u7b97\u5143\u52a0 1 \u524d\u7684\u503c\u3002<\/td>\u5047\u5982 x\u662f<\/code> 3\uff0c\u90a3 ++x<\/code> \u5c07\u628a x<\/code> \u8a2d\u5b9a\u70ba 4 \u4e26\u56de\u50b3 4\uff0c\u800c x++ \u6703\u56de\u50b3<\/code> 3 \uff0c \u63a5\u8457\u624d\u628a x \u8a2d\u5b9a\u70ba<\/code> 4\u3002<\/td><\/tr>
\u6e1b\u5c11\u00a0(en-US)<\/small><\/a>\u00a0(--<\/code>)<\/td>\u4e00\u5143\u904b\u7b97\u5b50\u3002 \u5c07\u904b\u7b97\u5143\u6e1b\u5c11 1\u3002\u56de\u50b3\u503c\u7684\u60c5\u6cc1\u8207 \u589e\u52a0\u904b\u7b97\u5143 \u76f8\u540c\u3002<\/td>\u5047\u5982 x\u662f<\/code> 3\uff0c\u90a3 --x<\/code> \u5c07\u628a x<\/code> \u8a2d\u5b9a\u70ba 2 \u4e26\u56de\u50b3 2\uff0c\u800c x-- \u6703\u56de\u50b3<\/code> 3 \uff0c \u63a5\u8457\u624d\u628a x \u8a2d\u5b9a\u70ba<\/code> 2\u3002<\/td><\/tr>
(\u4e00\u5143\u904b\u7b97\u5b50)\u6e1b\u865f\u00a0(en-US)<\/small><\/a>\u00a0(-<\/code>)<\/td>\u4e00\u5143\u904b\u7b97\u5b50\u3002\u56de\u50b3\u904b\u7b97\u5143\u7684\u8ca0\u6578\u3002<\/td>\u5047\u5982 x \u662f 3\uff0c-x \u56de\u50b3 -3\u3002<\/td><\/tr>
(\u4e00\u5143\u904b\u7b97\u5b50)\u52a0\u865f\u00a0(en-US)<\/small><\/a>\u00a0(+<\/code>)<\/td>\u4e00\u5143\u904b\u7b97\u5b50\u3002\u5617\u8a66\u5c07\u904b\u7b97\u5143\u8f49\u63db\u6210\u6578\u5b57\uff0c\u5047\u5982\u5b83\u9084\u4e0d\u662f\u6578\u5b57\u7684\u8a71\u3002<\/td>+\"3\"<\/code> \u56de\u50b3 3<\/code>\u3002 +true<\/code> \u56de\u50b3 1.<\/code><\/td><\/tr>
\u6307\u6578\u904b\u7b97\u5b50\u00a0(en-US)<\/small><\/a>\u00a0(**<\/code>)\u00a0\u5be6\u9a57\u6027\u8cea<\/td>\u8a08\u7b97\u4ee5 a \u70ba\u5e95\u7684 b<\/code> \u6b21\u65b9\uff0c \u4e5f\u5c31\u662f, a^b<\/code><\/td>2 ** 3<\/code> \u56de\u50b3 8<\/code>. 10 ** -1<\/code> \u56de\u50b3 0.1<\/code>.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

\u4f4d\u5143\u904b\u7b97\u5b50<\/a><\/h2>\n\n\n\n
\u904b\u7b97\u5b50<\/th>\u7528\u6cd5<\/th>\u63cf\u8ff0<\/th><\/tr><\/thead>
\u4f4d\u5143 AND\u00a0(en-US)<\/small><\/a><\/td>a & b<\/code><\/td>\u56de\u50b3\u5169\u500b\u904b\u7b97\u5143\u5c0d\u65bc\u6bcf\u500b bit \u505a AND \u7684\u7d50\u679c\u3002<\/td><\/tr>
\u4f4d\u5143 OR\u00a0(en-US)<\/small><\/a><\/td>a | b<\/code><\/td>\u56de\u50b3\u5169\u500b\u904b\u7b97\u5143\u5c0d\u65bc\u6bcf\u500b bit \u505a OR \u7684\u7d50\u679c\u3002<\/td><\/tr>
\u4f4d\u5143 XOR\u00a0(en-US)<\/small><\/a><\/td>a ^ b<\/code><\/td>\u56de\u50b3\u5169\u500b\u904b\u7b97\u5143\u5c0d\u65bc\u6bcf\u500b bit \u505a XOR \u7684\u7d50\u679c\u3002<\/td><\/tr>
\u4f4d\u5143 NOT\u00a0(en-US)<\/small><\/a><\/td>~ a<\/code><\/td>\u5c07\u904b\u7b97\u5143\u4e2d\u7684\u6bcf\u500b bit \u53cd\u8f49(1->0,0->1)\u3002<\/td><\/tr>
\u5de6\u79fb\u00a0(en-US)<\/small><\/a><\/td>a << b<\/code><\/td>\u5c07 a<\/code> \u7684\u6bcf\u500b bit \u5411\u5de6\u79fb\u52d5 b<\/code> \u500b bits\uff0c\u7a7a\u9918\u7684\u4f4d\u6578\u4ee5 0 \u586b\u6eff\u3002<\/td><\/tr>
\u6709\u865f\u53f3\u79fb\u00a0(en-US)<\/small><\/a><\/td>a >> b<\/code><\/td>\u5c07 a<\/code> \u7684\u6bcf\u500b bit \u5411\u53f3\u79fb\u52d5 b<\/code> \u500b bits\uff0c\u7a7a\u9918\u4f4d\u6578\u4ee5\u6700\u9ad8\u4f4d\u88dc\u6eff\u3002<\/td><\/tr>
\u4ee5 0 \u586b\u5145\u7684\u53f3\u79fb\u00a0(en-US)<\/small><\/a><\/td>a >>> b<\/code><\/td>\u5c07 a<\/code> \u7684\u6bcf\u500b bit \u5411\u53f3\u79fb\u52d5 b<\/code> \u500b bits\uff0c\u7a7a\u9918\u7684\u4f4d\u6578\u4ee5 0 \u586b\u6eff\u3002<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

\u4f4d\u5143\u908f\u8f2f\u904b\u7b97\u5b50<\/h2>\n\n\n\n
\u904b\u7b97\u5f0f<\/th>\u7d50\u679c<\/th>\u4e8c\u5143\u63cf\u8ff0\u5f0f<\/th><\/tr><\/thead>
15 & 9<\/code><\/td>9<\/code><\/td>1111 & 1001 = 1001<\/code><\/td><\/tr>
15 | 9<\/code><\/td>15<\/code><\/td>1111 | 1001 = 1111<\/code><\/td><\/tr>
15 ^ 9<\/code><\/td>6<\/code><\/td>1111 ^ 1001 = 0110<\/code><\/td><\/tr>
~15<\/code><\/td>-16<\/code><\/td>~ 0000 0000 \u2026 0000 1111 = 1111 1111 \u2026 1111 0000<\/code><\/td><\/tr>
~9<\/code><\/td>-10<\/code><\/td>~ 0000 0000 \u2026 0000 1001 = 1111 1111 \u2026 1111 0110<\/code><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

\u4f4d\u5143\u79fb\u52d5\u904b\u7b97\u5b50<\/h2>\n\n\n\n
\u904b\u7b97\u5b50<\/th>\u63cf\u8ff0<\/th>\u7bc4\u4f8b<\/th><\/tr><\/thead>
\u5de6\u79fb\u00a0(en-US)<\/small><\/a>\u00a0(<<<\/code>)<\/td>\u9019\u500b\u904b\u7b97\u5b50\u6703\u5c07\u7b2c \u4e00\u500b\u904b\u7b97\u5143\u7684\u6bcf\u500b bit \u5411\u5de6\u79fb\u52d5 \u7b2c\u4e8c\u500b\u904b\u7b97\u5143\u6240\u6307\u5b9a\u7684 bit \u6578\u91cf\u3002\u5de6\u908a\u8d85\u51fa\u7684\u4f4d\u6578\u6703\u88ab\u6368\u68c4\uff0c\u53f3\u908a\u7a7a\u51fa\u7684\u4f4d\u6578\u4ee5 0 \u88dc\u9f4a\u3002<\/td>9<<2<\/code> \u5f97\u5230 36\uff0c\u56e0\u70ba 1001 \u5411\u5de6\u79fb\u52d5 2 bits \u6703\u5f97\u5230 100100\uff0c \u4e5f\u5c31\u662f\u4e8c\u9032\u4f4d\u7684 36\u3002<\/td><\/tr>
\u6709\u865f\u53f3\u79fb\u00a0(en-US)<\/small><\/a>\u00a0(>><\/code>)<\/td>\u9019\u500b\u904b\u7b97\u5b50\u6703\u5c07\u7b2c \u4e00\u500b\u904b\u7b97\u5143\u7684\u6bcf\u500b bit \u5411\u53f3\u79fb\u52d5 \u7b2c\u4e8c\u500b\u904b\u7b97\u5143\u6240\u6307\u5b9a\u7684 bit \u6578\u91cf\u3002\u53f3\u908a\u8d85\u51fa\u7684\u4f4d\u6578\u6703\u88ab\u6368\u68c4\uff0c\u5de6\u908a\u7a7a\u51fa\u7684\u4f4d\u6578\u4ee5\u6700\u9ad8\u4f4d\u88dc\u9f4a\u3002<\/td>9>>2<\/code> \u5f97\u5230 2\uff0c\u56e0\u70ba 1001 \u5411\u53f3\u79fb\u52d5 2 bits \u6703\u5f97\u5230 10\uff0c\u4e5f\u5c31\u662f\u4e8c\u9032\u4f4d\u7684 2\u3002 \u76f8\u540c\u7684\uff0c -9>>2<\/code> \u6703\u5f97\u5230 -3\uff0c\u56e0\u70ba\u6700\u9ad8\u4f4d\u7528\u4f86\u8868\u793a\u6b63\u8ca0\u865f\u7684 bit \u88ab\u4fdd\u7559\u4e86\u3002<\/td><\/tr>
\u4ee5 0 \u586b\u5145\u7684\u53f3\u79fb\u00a0(en-US)<\/small><\/a>\u00a0(>>><\/code>)<\/td>\u9019\u500b\u904b\u7b97\u5b50\u6703\u5c07\u7b2c \u4e00\u500b\u904b\u7b97\u5143\u7684\u6bcf\u500b bit \u5411\u53f3\u79fb\u52d5 \u7b2c\u4e8c\u500b\u904b\u7b97\u5143\u6240\u6307\u5b9a\u7684 bit \u6578\u91cf\u3002\u53f3\u908a\u8d85\u51fa\u7684\u4f4d\u6578\u6703\u88ab\u6368\u68c4\uff0c\u5de6\u908a\u7a7a\u51fa\u7684\u4f4d\u6578\u4ee5 0 \u88dc\u9f4a\u3002<\/td>19>>>2 \u5f97\u5230<\/code> 4\uff0c \u56e0\u70ba 10011 \u5411\u53f3\u79fb\u52d5 2 bits \u6703\u5f97\u5230 100\uff0c\u662f\u4e8c\u9032\u4f4d\u7684 4\u3002\u5c0d\u65bc\u975e\u8ca0\u7684\u6578\u5b57\u800c\u8a00\uff0c \u4ee5 0 \u586b\u5145\u7684\u53f3\u79fb \u6703\u5f97\u5230\u548c \u6709\u865f\u53f3\u79fb\u76f8\u540c\u7684\u7d50\u679c\u3002<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

\u908f\u8f2f\u904b\u7b97\u5b50<\/a><\/h2>\n\n\n\n
Operator<\/th>Usage<\/th>Description<\/th><\/tr><\/thead>
\u908f\u8f2f AND\u00a0(en-US)<\/small><\/a>\u00a0(&&<\/code>)<\/td>\u904b\u7b97\u5f0f1 && \u904b\u7b97\u5f0f2<\/code><\/td>\u5047\u5982 \u904b\u7b97\u5f0f1<\/code> \u53ef\u4ee5\u88ab\u8f49\u63db\u6210 false \u7684\u8a71\uff0c\u56de\u50b3 \u904b\u7b97\u5f0f1<\/code>; \u5426\u5247\uff0c\u56de\u50b3 \u904b\u7b97\u5f0f2<\/code>\u3002 \u56e0\u6b64\uff0c&&<\/code>\u53ea\u6709\u5728 \u5169\u500b\u904b\u7b97\u5143\u90fd\u662f True \u6642\u624d\u6703\u56de\u50b3 True\uff0c\u5426\u5247\u56de\u50b3 false<\/code>\u3002<\/td><\/tr>
\u908f\u8f2f OR\u00a0(en-US)<\/small><\/a>\u00a0(||<\/code>)<\/td>\u904b\u7b97\u5f0f1 || \u904b\u7b97\u5f0f2<\/code><\/td>\u5047\u5982 \u904b\u7b97\u5f0f1<\/code> \u53ef\u4ee5\u88ab\u8f49\u63db\u6210 true \u7684\u8a71\uff0c\u56de\u50b3 \u904b\u7b97\u5f0f1<\/code>; \u5426\u5247\uff0c\u56de\u50b3 \u904b\u7b97\u5f0f2<\/code>\u3002 \u56e0\u6b64\uff0c||<\/code>\u5728 \u5169\u500b\u904b\u7b97\u5143\u6709\u4efb\u4e00\u500b\u662f True \u6642\u5c31\u6703\u56de\u50b3 True\uff0c\u5426\u5247\u56de\u50b3 false<\/code>\u3002<\/td><\/tr>
\u908f\u8f2f NOT\u00a0(en-US)<\/small><\/a>\u00a0(!<\/code>)<\/td>!\u904b\u7b97\u5f0f<\/code><\/td>\u5047\u5982\u55ae\u4e00\u500b\u904b\u7b97\u5143\u80fd\u88ab\u8f49\u63db\u6210 True \u6642\uff0c\u56de\u50b3false<\/code> \uff0c \u4e0d\u7136\u56de\u50b3 true<\/code>\u3002<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

\u53c3\u8003\u8cc7\u6599\uff1ahttps:\/\/developer.mozilla.org\/zh-TW\/docs\/Web\/JavaScript\/Guide\/Expressions_and_operators<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

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