{"id":3256,"date":"2021-05-26T21:28:58","date_gmt":"2021-05-26T13:28:58","guid":{"rendered":"http:\/\/www.yuguoxy.com\/geekhome\/?p=3256"},"modified":"2026-08-18T12:35:34","modified_gmt":"2026-08-18T04:35:34","slug":"javascript%e4%ba%8c%e7%bb%b4%e6%95%b0%e7%bb%84%e4%bb%8b%e7%bb%8d","status":"publish","type":"post","link":"https:\/\/ai.zhousir.top\/?p=3256","title":{"rendered":"javascript\u4e8c\u7ef4\u6570\u7ec4\u4ecb\u7ecd"},"content":{"rendered":"
\n

JavaScript \u6ca1\u6709\u5355\u72ec\u7684\u300c\u4e8c\u7ef4\u6570\u7ec4\u7c7b\u578b\u300d\u3002\u6240\u8c13\u4e8c\u7ef4\u6570\u7ec4\uff0c\u5c31\u662f\u5143\u7d20\u4ecd\u662f\u6570\u7ec4<\/strong> \u7684\u6570\u7ec4\u3002\u8bbf\u95ee\u5199\u6210 a[\u884c][\u5217]<\/code>\uff0c\u5148\u53d6\u5916\u5c42\u4e0b\u6807\u5f97\u5230\u4e00\u884c\uff0c\u518d\u53d6\u5185\u5c42\u4e0b\u6807\u5f97\u5230\u5355\u5143\u683c\u3002<\/p>\n

\u4e0b\u9762\u6309\u5b9a\u4e49\u3001\u521d\u59cb\u5316\u3001\u904d\u5386\u3001\u5bf9\u89d2\u7ebf\u6c42\u548c\u3001\u6253\u5370\u4e0b\u4e09\u89d2\u4e94\u6b65\u628a\u5e38\u7528\u64cd\u4f5c\u8d70\u4e00\u904d\u3002\u4e0b\u6807\u90fd\u4ece 0 \u5f00\u59cb\u3002<\/p>\n

\u4e00\u3001\u5b9a\u4e49\uff1a\u6570\u7ec4\u7684\u6570\u7ec4<\/h2>\n

\u957f\u5ea6\u4e3a 4 \u7684\u5916\u5c42\u6570\u7ec4\uff0c\u6bcf\u4e2a\u5143\u7d20\u53c8\u662f\u957f\u5ea6 4 \u7684\u5185\u5c42\u6570\u7ec4\u3002\u53f3\u4fa7\u6ce8\u91ca\u6807\u51fa\u4e86\u6bcf\u4e2a\u683c\u5b50\u7684\u4e0b\u6807\uff1a<\/p>\n

var arr = [[1,2,4,6],[2,4,7,8],[8,9,10,11],[9,12,13,15]] \/\/arr\u6570\u7ec4\u957f\u5ea6\u4e3a4,\u6bcf\u4e2a\u5143\u7d20\u662f\u4e00\u4e2a\u957f\u5ea6\u4e3a4\u7684\u6570\u7ec4\nvar a = [\n    [1,2,4,6],      \/\/ a[0][0] a[0][1] a[0][2] a[0][3]\n    [2,4,7,8],      \/\/ a[1][0] a[1][1] a[1][2] a[1][3]\n    [8,9,10,11],    \/\/ a[2][0] a[2][1] a[2][2] a[2][3]\n    [9,12,13,15]    \/\/ a[3][0] a[3][1] a[3][2] a[3][3]\n]<\/code><\/pre>\n\n\n\n\n\n\n\n\n
\u5199\u6cd5<\/th>\n\u542b\u4e49<\/th>\n\u4f8b\u5b50<\/th>\n<\/tr>\n<\/thead>\n
a[0]<\/code><\/td>\n\u7b2c 0 \u884c\uff08\u4ecd\u662f\u6570\u7ec4\uff09<\/td>\n[1,2,4,6]<\/td>\n<\/tr>\n
a[0][2]<\/code><\/td>\n\u7b2c 0 \u884c\u7b2c 2 \u5217<\/td>\n4<\/td>\n<\/tr>\n
a.length<\/code><\/td>\n\u884c\u6570<\/td>\n4<\/td>\n<\/tr>\n
a[i].length<\/code><\/td>\n\u7b2c i \u884c\u7684\u5217\u6570<\/td>\n\u672c\u4f8b\u6bcf\u884c\u90fd\u662f 4<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
\u4e8c\u3001\u521d\u59cb\u5316<\/h2>\n
\u5148 new Array(10)<\/code> \u5f97\u5230 10 \u4e2a\u7a7a\u4f4d\uff0c\u518d\u7ed9\u6bcf\u4e00\u884c new Array(8)<\/code>\uff0c\u586b\u5165 i + j<\/code>\u3002\u7ed3\u679c\u662f 10 \u884c 8 \u5217\uff0c\u7b2c i \u884c\u7b2c j \u5217\u7b49\u4e8e i+j\uff1a<\/p>\n
\/*\n            0   1   2   3   4   5   6   7\n            1   2   3   4   5   6   7   8\n            2   3   4   5   6   7   8   9\n            3   4   5   6   7   8   9   10\n            4   5   6   7   8   9   10   11\n            5   6   7   8   9   10   11   12\n            6   7   8   9   10   11   12   13\n            7   8   9   10   11   12   13   14\n            8   9   10   11   12   13   14   15\n            9   10   11   12   13   14   15   16\n*\/\nfunction initTwoArray() {\n    var arr = new Array(10); \/\/ \u521b\u5efa\u957f\u5ea6\u4e3a10\u7684\u6570\u7ec4arr\n    for (var i = 0; i < arr.length; i++) {\n        arr[i] = new Array(8); \/\/ \u7ed9\u6570\u7ec4arr\u6bcf\u4e2a\u5143\u7d20\u8d4b\u503c\u957f\u5ea6\u4e3a8\u7684\u6570\u7ec4, \u8fd9\u65f6arr\u6210\u4e3a\u4e8c\u7ef4\u6570\u7ec4\n        for (var j = 0; j < 8; j++) {\n            arr[i][j] = i + j;\n        }\n    }\n}<\/code><\/pre>\n
\u4e09\u3001\u53cc\u91cd\u5faa\u73af\u904d\u5386<\/h2>\n
\u5916\u5c42\u8d70\u884c\uff0c\u5185\u5c42\u8d70\u8be5\u884c\u7684\u5217\u3002\u7528 arr[i].length<\/code> \u800c\u4e0d\u662f\u5199\u6b7b\u5217\u6570\uff0c\u884c\u5217\u4e0d\u9f50\u65f6\u4e5f\u4e0d\u4f1a\u8d8a\u754c\uff1a<\/p>\n
function printArray(arr) {\n    for (var i = 0; i < arr.length; i++) {\n        for (var j = 0; j < arr[i].length; j++) {\n            document.write(arr[i][j] + '&nbsp;&nbsp;&nbsp;')\n        }\n        document.write('<br\/>')\n    }\n}<\/code><\/pre>\n
\u56db\u3001\u4e3b\u5bf9\u89d2\u7ebf\u6c42\u548c<\/h2>\n
\u4e3b\u5bf9\u89d2\u7ebf\u6ee1\u8db3 i == j<\/code>\u3002\u65b9\u9635\u65f6\u5c31\u662f a[0][0] + a[1][1] + \u2026<\/code>\uff1a<\/p>\n
function diagonalSum(arr) {\n    var sum = 0\n    for (var i = 0; i < arr.length; i++) {\n        for (var j = 0; j < arr[i].length; j++) {\n            if (i == j) {\n                sum = sum + arr[i][j]\n            }\n        }\n    }\n    document.write('sum = ' + sum)\n}<\/code><\/pre>\n
\u4e94\u3001\u6253\u5370\u4e0b\u4e09\u89d2<\/h2>\n
\u4e0b\u4e09\u89d2\u4fdd\u7559 i >= j<\/code> \u7684\u683c\u5b50\uff08\u542b\u5bf9\u89d2\u7ebf\uff09\uff0c\u5176\u4f59\u8df3\u8fc7\u3002\u5bf9\u5f00\u5934\u90a3\u4e2a 4\u00d74 \u793a\u4f8b\uff0c\u6253\u5370\u51fa\u6765\u5c31\u662f\uff1a<\/p>\n
\/*\n            1\n            2   4\n            8   9   10\n            9   12   13   15\n*\/\nfunction printTriangle(arr) {\n    for (var i = 0; i < arr.length; i++) {\n        for (var j = 0; j < arr[i].length; j++) {\n            if (i >= j) {\n                document.write(arr[i][j] + '&nbsp;&nbsp;&nbsp;')\n            }\n        }\n        document.write('<br\/>')\n    }\n}<\/code><\/pre>\n
\n
\u4e00\u53e5\u8bdd\u603b\u7ed3\uff1a\u4e8c\u7ef4\u6570\u7ec4\u5c31\u662f\u5d4c\u5957\u6570\u7ec4\uff1a\u7528\u53cc\u91cd\u4e0b\u6807\u53d6\u503c\uff0c\u7528\u53cc\u91cd\u5faa\u73af\u521d\u59cb\u5316\u3001\u904d\u5386\uff0c\u518d\u7528 i \u4e0e j \u7684\u5173\u7cfb\u7b5b\u5bf9\u89d2\u7ebf\u6216\u4e09\u89d2\u533a\u57df\u3002<\/strong><\/p>\n<\/blockquote>\n<\/section>\n","protected":false},"excerpt":{"rendered":"
JavaScript \u6ca1\u6709\u5355\u72ec\u7684\u300c\u4e8c\u7ef4\u6570\u7ec4\u7c7b\u578b\u300d\u3002\u6240\u8c13\u4e8c\u7ef4\u6570\u7ec4\uff0c\u5c31\u662f\u5143\u7d20\u4ecd\u662f\u6570\u7ec4 \u7684\u6570\u7ec4\u3002\u8bbf\u95ee\u5199\u6210 a[\u884c][ […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[109,105],"tags":[150,158],"_links":{"self":[{"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/posts\/3256"}],"collection":[{"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=3256"}],"version-history":[{"count":2,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/posts\/3256\/revisions"}],"predecessor-version":[{"id":3258,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/posts\/3256\/revisions\/3258"}],"wp:attachment":[{"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=3256"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=3256"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=3256"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}