{"id":1035,"date":"2022-04-16T22:18:38","date_gmt":"2022-04-16T14:18:38","guid":{"rendered":"http:\/\/zhuxinyong.com\/?p=1035"},"modified":"2023-02-16T14:39:58","modified_gmt":"2023-02-16T06:39:58","slug":"6-javascript-zhong-de-shu-zu","status":"publish","type":"post","link":"https:\/\/zhuxinyong.com\/?p=1035","title":{"rendered":"6 – JavaScript \u4e2d\u7684\u6570\u7ec4"},"content":{"rendered":"

\"\"<\/p>\n

\u539f\u6587\u5730\u5740\uff1ahttps:\/\/dev.to\/bhagatparwinder\/arrays-in-javascript-5fc7<\/a><\/p>\n

<\/span><\/a>\u4ec0\u4e48\u662f\u6570\u7ec4\uff1f<\/h3>\n

JavaScript \u4e2d\u7684\u6570\u7ec4\u662f\u4e00\u79cd\u7528\u4e8e\u5b58\u50a8\u591a\u4e2a\u5143\u7d20\u6216\u987a\u5e8f\u91cd\u8981\u7684\u4e00\u79cd\u6570\u636e\u7ed3\u6784\u3002\u8bb0\u4f4f\u6570\u7ec4\u7684 typeof<\/strong> \u8fd4\u56de\u7684\u662f\u5bf9\u8c61\u3002<\/p>\n

\u6570\u7ec4\u4e2d\u7684\u6bcf\u4e2a\u5143\u7d20\u90fd\u6709\u4e0b\u6807\uff0c\u4e0b\u6807\u5c31\u662f\u5143\u7d20\u5728\u6570\u7ec4\u4e2d\u7684\u4f4d\u7f6e\u3002\u6570\u7ec4\u7684\u4e0b\u6807\u662f\u4ece0\u5f00\u59cb\u7684\uff0c\u7b2c\u4e00\u4e2a\u5143\u7d20\u7684\u4e0b\u6807\u662f 0 \uff0c\u7b2c\u4e8c\u4e2a\u7684\u4e0b\u6807\u662f 1 \u4ee5\u6b64\u7c7b\u63a8\u3002\u5143\u7d20\u7684\u603b\u4e2a\u6570\u5c31\u662f\u6570\u7ec4\u7684\u957f\u5ea6\u3002<\/p>\n

<\/span><\/a>\u5982\u4f55\u521b\u5efa\u4e00\u4e2a\u6570\u7ec4\uff1f<\/h3>\n
\/\/ Using the square bracket notation\nconst carArray = ["Honda", "BMW", "Ferrari", 27, true];\n\n\/\/ Using new keyword\nconst bikeArray = new Array("Honda", "Ducati", "Yamaha");\n<\/code><\/pre>\n
\u26a0\ufe0f\u8b66\u544a\uff1a\u4e0d\u63a8\u8350\u4f7f\u7528 new \u5173\u952e\u5b57\u6765\u521b\u5efa\u6570\u7ec4\uff0c\u4e0b\u9762\u4f1a\u4ecb\u7ecd\u5230\u3002<\/p>\n
<\/span><\/a>\u5982\u4f55\u5224\u65ad\u4e00\u4e2a\u53d8\u91cf\u662f\u5426\u4e3a\u6570\u7ec4\uff1f<\/h3>\n
\u56e0\u4e3a typeof<\/strong> \u6570\u7ec4\u8fd4\u56de\u7684\u662f\u5bf9\u8c61\uff0c\u5f53\u4f60\u6267\u884c\u4ee5\u4e0b\u64cd\u4f5c\u65f6\uff1a<\/p>\n
const carArray = ["Honda", "BMW", "Ferrari", 27, true];\nconsole.log(typeof(carArray)); \/\/ output will be object!\n<\/code><\/pre>\n
\u4f60\u5e94\u8be5\u6309\u7167\u4e0b\u9762\u7684\u505a\uff1a<\/p>\n
const carArray = ["Honda", "BMW", "Ferrari", 27, true];\nconsole.log(Array.isArray(carArray)); \/\/ true\n<\/code><\/pre>\n
\u6211\u4eec\u540c\u6837\u53ef\u4ee5\u8fd9\u6837\uff1a<\/p>\n
const carArray = ["Honda", "BMW", "Ferrari", 27, true];\ncarArray instanceof Array; \/\/ true\n<\/code><\/pre>\n
<\/span><\/a>\u5982\u4f55\u83b7\u53d6\u6570\u7ec4\u4e2d\u7684\u5143\u7d20\uff1f<\/h3>\n
\u7b54\u6848\u662f\uff1a\u4e0b\u6807\u3002<\/p>\n
const carArray = ["Honda", "BMW", "Ferrari", 27, true];\nconsole.log(carArray[2]); \/\/ Ferrari\n<\/code><\/pre>\n
\u8bb0\u4f4f Ferrari \u5373\u4f7f\u5728\u6570\u7ec4\u4e2d\u662f\u7b2c\u4e09\u4e2a\u5143\u7d20\uff0c\u7531\u4e8e\u4e0b\u6807\u662f\u4ece 0 \u5f00\u59cb\u6240\u4ee5\u5b83\u7684\u4e0b\u6807\u662f 2\u3002<\/p>\n
<\/span><\/a>\u66f4\u6539\u6570\u7ec4\u4e2d\u7684\u5143\u7d20<\/h3>\n
\u4fee\u6539\u5143\u7d20\u5c31\u50cf\u4f60\u4ece\u6570\u7ec4\u4e2d\u83b7\u53d6\u5143\u7d20\u4e00\u6837\uff0c\u90fd\u53ef\u4ee5\u901a\u8fc7\u4e0b\u6807\uff1a<\/p>\n
const carArray = ["Honda", "BMW", "Ferrari", 27, true];\ncarArray[2] = "Mazda";\nconsole.log(carArray); \/\/ [ 'Honda', 'BMW', 'Mazda', 27, true ]\u2008\n<\/code><\/pre>\n
<\/span><\/a>\u6570\u7ec4\u7684\u957f\u5ea6<\/h3>\n
\u4f7f\u7528 length<\/strong> \u5c5e\u6027\u83b7\u5f97\uff1a<\/p>\n
const carArray = ["Honda", "BMW", "Ferrari", 27, true];\nconsole.log(carArray.length); \/\/ 5\n<\/code><\/pre>\n
\u82e5\u8981\u83b7\u53d6\u6700\u540e\u4e00\u4e2a\u5143\u7d20\uff0c\u4f60\u53ef\u4ee5\u8fd9\u6837\uff1a<\/p>\n
const carArray = ["Honda", "BMW", "Ferrari", 27];\nconsole.log(carArray[carArray.length - 1]); \/\/ 27\n<\/code><\/pre>\n
<\/span><\/a>\u6570\u7ec4\u4e2d\u7684\u5e38\u7528\u65b9\u6cd5<\/h3>\n
\u4e0b\u7bc7\u6587\u7ae0\u6211\u4f1a\u4ecb\u7ecd\u8bb8\u591a\u6570\u7ec4\u7684\u65b9\u6cd5\uff0c\u4f46\u73b0\u5728\u6211\u53ea\u4ecb\u7ecd\u53e6\u4e2a\u5e38\u7528\u65b9\u6cd5\uff1a<\/p>\n
    \n
  1. Push: \u5411\u6570\u7ec4\u672b\u5c3e\u6dfb\u52a0\u5143\u7d20<\/li>\n<\/ol>\n
    const carArray = ["Honda", "BMW", "Ferrari", 27, true];\ncarArray.push("Mazda");\nconsole.log(carArray); \/\/ [ 'Honda', 'BMW', 'Ferrari', 27, true, 'Mazda' ]\u2008\n<\/code><\/pre>\n
      \n
    1. Sort: \u4e3a\u6570\u7ec4\u6392\u5e8f\uff0c\u4e14\u4f1a\u6539\u53d8\u539f\u6570\u7ec4<\/li>\n<\/ol>\n
      const carArray = ["Honda", "BMW", "Ferrari", 27, true];\ncarArray.sort();\nconsole.log(x); \/\/ [ 27, 'BMW', 'Ferrari', 'Honda', true ]\u2008\n<\/code><\/pre>\n
      <\/span><\/a>\u4e3a\u4f55\u4e0d\u63a8\u8350\u4f7f\u7528 new \u6765\u521b\u5efa\u6570\u7ec4\uff1f<\/h3>\n
      \u4e2d\u62ec\u53f7\u548c new \u5173\u952e\u5b57\u5728\u521b\u5efa\u7a7a\u6570\u7ec4\u6216\u4f9d\u7167\u4f20\u5165\u7684\u6570\u636e\u6765\u521b\u5efa\u6570\u7ec4\u662f\u4e00\u6837\u7684\u3002<\/p>\n
      \u4f46 new<\/strong> \u5173\u952e\u5b57\u6709\u65f6\u5019\u4f1a\u8868\u73b0\u548c\u9884\u671f\u6709\u5dee\u5f02\uff1a<\/p>\n
      let score = new Array(5, 10);\nconsole.log(score); \/\/ [ 5, 10 ]\n\nscore = new Array(5);\nconsole.log(score); \/\/ [ , , , ,  ]\n<\/code><\/pre>\n
      \u7b2c\u4e00\u4e2a\u521b\u5efa\u4e86\u4e00\u4e2a\u5305\u542b 5 \u548c 10 \u7684\u6570\u7ec4\uff0c\u4f46\u7b2c\u4e8c\u4e2a\u5374\u751f\u6210\u4e86 5 \u4e2a\u5305\u542b undefined \u7684\u6570\u7ec4\u800c\u4e0d\u662f\u5305\u542b5\u7684\u6570\u7ec4\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
      \u539f\u6587\u5730\u5740\uff1ahttps:\/\/dev.to\/bhagatparwinder\/arrays-in-java...<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[249,2,20,3],"tags":[96,6],"class_list":["post-1035","post","type-post","status-publish","format-standard","hentry","category-javascript","category-all","category-frontend","category-tech","tag-array","tag-javascript"],"_links":{"self":[{"href":"https:\/\/zhuxinyong.com\/index.php?rest_route=\/wp\/v2\/posts\/1035","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/zhuxinyong.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/zhuxinyong.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/zhuxinyong.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/zhuxinyong.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1035"}],"version-history":[{"count":1,"href":"https:\/\/zhuxinyong.com\/index.php?rest_route=\/wp\/v2\/posts\/1035\/revisions"}],"predecessor-version":[{"id":1036,"href":"https:\/\/zhuxinyong.com\/index.php?rest_route=\/wp\/v2\/posts\/1035\/revisions\/1036"}],"wp:attachment":[{"href":"https:\/\/zhuxinyong.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1035"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/zhuxinyong.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1035"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/zhuxinyong.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1035"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}