{"id":166096,"date":"2024-05-08T15:29:37","date_gmt":"2024-05-08T07:29:37","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/166096.html"},"modified":"2024-05-08T15:29:41","modified_gmt":"2024-05-08T07:29:41","slug":"javascript%e4%b8%adreturn-1%e6%98%af%e4%bb%80%e4%b9%88%e6%84%8f%e6%80%9d%ef%bc%8c%e6%b1%82%e5%a4%a7%e7%a5%9e%e6%8c%87%e7%82%b9","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/166096.html","title":{"rendered":"javascript\u4e2dreturn -1\u662f\u4ec0\u4e48\u610f\u601d\uff0c\u6c42\u5927\u795e\u6307\u70b9"},"content":{"rendered":"

\"javascript\u4e2dreturn<\/p>\n

\u5728JavaScript\u4e2d\uff0creturn -1<\/code>\u901a\u5e38\u8868\u793a\u5728\u4e00\u4e2a\u51fd\u6570\u6267\u884c\u7684\u8fc7\u7a0b\u4e2d\uff0c\u76ee\u6807\u503c\u672a\u88ab\u627e\u5230\u6216\u67d0\u4e2a\u6761\u4ef6\u672a\u88ab\u6ee1\u8db3\u3002\u8fd9\u79cd\u7528\u6cd5\u5e7f\u6cdb\u5e94\u7528\u4e8e\u6bd4\u8f83\u51fd\u6570\u3001\u641c\u7d22\u51fd\u6570\u548c\u6392\u5e8f\u7b97\u6cd5\u4e2d<\/strong>\uff0c\u5728\u8fd9\u4e9b\u573a\u666f\u4e0b\uff0c-1<\/code>\u4f5c\u4e3a\u4e00\u4e2a\u7279\u5b9a\u7684\u4fe1\u53f7\u503c\u8868\u8fbe\u4e86\u627e\u4e0d\u5230\u9879\u6216\u67d0\u79cd\u7279\u5b9a\u7684\u6bd4\u8f83\u7ed3\u679c\u3002\u7279\u522b\u5728\u6570\u7ec4\u7684\u641c\u7d22\u64cd\u4f5c\u4e2d\uff0creturn -1<\/code>\u7684\u7528\u6cd5\u5c24\u4e3a\u5e38\u89c1<\/strong>\uff0c\u4ee3\u8868\u7740\u641c\u7d22\u7684\u5143\u7d20\u5728\u6570\u7ec4\u4e2d\u4e0d\u5b58\u5728\u3002<\/p>\n<\/p>\n

\u4e00\u3001\u6bd4\u8f83\u51fd\u6570\u4e2d\u7684\u5e94\u7528<\/h3>\n<\/p>\n

\u5728JavaScript\u7684\u6bd4\u8f83\u51fd\u6570\u4e2d\uff0c\u5982\u6570\u7ec4\u7684sort()<\/code>\u65b9\u6cd5\uff0c\u81ea\u5b9a\u4e49\u6bd4\u8f83\u51fd\u6570\u53ef\u4ee5\u7528\u6765\u6307\u5b9a\u5143\u7d20\u6392\u5e8f\u7684\u65b9\u5f0f\u3002\u8fd9\u79cd\u6bd4\u8f83\u51fd\u6570\u9700\u8981\u8fd4\u56de\u4e09\u79cd\u53ef\u80fd\u7684\u503c\uff1a-1\u30010\u30011\u3002\u8fd9\u91cc\u7684return -1<\/code>\u610f\u5473\u7740\u7b2c\u4e00\u4e2a\u53c2\u6570\u5e94\u8be5\u6392\u5728\u7b2c\u4e8c\u4e2a\u53c2\u6570\u4e4b\u524d\u3002<\/p>\n<\/p>\n

\u4f8b\u5982\uff0c\u5bf9\u4e8e\u6574\u6570\u7684\u6392\u5e8f\uff0c\u4e00\u4e2a\u7b80\u5355\u7684\u6bd4\u8f83\u51fd\u6570\u53ef\u80fd\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n<\/p>\n

function compareNumbers(a, b) {<\/p>\n
  if (a < b) return -1;<\/p>\n
  if (a > b) return 1;<\/p>\n
  return 0;<\/p>\n
}<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u51fd\u6570\u4e2d\uff0c\u5982\u679ca<\/code>\u5c0f\u4e8eb<\/code>\uff0c\u5219\u8fd4\u56de-1\uff0c\u8868\u793aa<\/code>\u5e94\u8be5\u5728\u6392\u5e8f\u5e8f\u5217\u4e2d\u6392\u5728b<\/code>\u4e4b\u524d\u3002<\/p>\n<\/p>\n
\u4e8c\u3001\u641c\u7d22\u51fd\u6570\u4e2d\u7684\u5e94\u7528<\/h3>\n<\/p>\n
\u5728\u641c\u7d22\u7b97\u6cd5\u4e2d\uff0c\u5982\u6570\u7ec4\u7684indexOf()<\/code>\u6216findIndex()<\/code>\u65b9\u6cd5\uff0c\u5f53\u641c\u7d22\u9879\u5728\u6570\u7ec4\u4e2d\u4e0d\u5b58\u5728\u65f6\uff0c\u8fd9\u4e9b\u65b9\u6cd5\u4f1a\u8fd4\u56de-1\u3002\u8fd9\u79cd\u65b9\u5f0f\u4e3a\u5f00\u53d1\u8005\u63d0\u4f9b\u4e86\u4e00\u79cd\u7b80\u6d01\u7684\u624b\u6bb5\u6765\u68c0\u67e5\u67d0\u4e2a\u503c\u662f\u5426\u5b58\u5728\u4e8e\u6570\u7ec4\u4e2d\u3002<\/p>\n<\/p>\n
\u4ee5indexOf()<\/code>\u4e3a\u4f8b\uff0c\u5728\u67e5\u627e\u6570\u7ec4\u4e2d\u7684\u5143\u7d20\u65f6\uff0c\u5982\u679c\u627e\u5230\u4e86\u76ee\u6807\u5143\u7d20\uff0c\u5b83\u4f1a\u8fd4\u56de\u8be5\u5143\u7d20\u5728\u6570\u7ec4\u4e2d\u7684\u7d22\u5f15\uff1b\u5982\u679c\u6ca1\u6709\u627e\u5230\uff0c\u5c31\u4f1a\u8fd4\u56de-1\u3002<\/p>\n<\/p>\n
let fruits = ["apple", "banana", "cherry"];<\/p>\n
let index = fruits.indexOf("banana"); \/\/ \u8fd4\u56de 1<\/p>\n
let notFound = fruits.indexOf("orange"); \/\/ \u8fd4\u56de -1<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u8fd9\u91cc\uff0cindexOf("banana")<\/code>\u4f1a\u8fd4\u56de1\uff0c\u56e0\u4e3a"banana"\u5b58\u5728\u4e8e\u6570\u7ec4\u4e2d\u3002\u800cindexOf("orange")<\/code>\u4f1a\u8fd4\u56de-1\uff0c\u56e0\u4e3a"orange"\u4e0d\u5728\u6570\u7ec4\u4e2d\u3002<\/p>\n<\/p>\n
\u4e09\u3001\u6392\u5e8f\u7b97\u6cd5\u4e2d\u7684\u5e94\u7528<\/h3>\n<\/p>\n
\u5728\u5b9e\u73b0\u81ea\u5b9a\u4e49\u7684\u6392\u5e8f\u7b97\u6cd5\u65f6\uff0creturn -1<\/code>\u53ef\u4ee5\u7528\u4e8e\u6307\u793a\u67d0\u4e2a\u5143\u7d20\u5e94\u8be5\u88ab\u653e\u7f6e\u5728\u53e6\u4e00\u4e2a\u5143\u7d20\u4e4b\u524d\u3002\u8fd9\u5bf9\u4e8e\u590d\u6742\u7684\u6392\u5e8f\u89c4\u5219\u5c24\u5176\u6709\u7528\uff0c\u5982\u6839\u636e\u5bf9\u8c61\u7684\u67d0\u4e2a\u5c5e\u6027\u8fdb\u884c\u6392\u5e8f\u3002<\/p>\n<\/p>\n
\u8003\u8651\u4e0b\u8ff0\u6839\u636e\u5bf9\u8c61\u7684age<\/code>\u5c5e\u6027\u5bf9\u6570\u7ec4\u8fdb\u884c\u6392\u5e8f\u7684\u4f8b\u5b50\uff1a<\/p>\n<\/p>\n
let people = [{ name: "John", age: 30 }, { name: "Amy", age: 22 }, { name: "Camila", age: 25 }];<\/p>\n
people.sort(function(a, b) {<\/p>\n
  if (a.age < b.age) return -1;<\/p>\n
  if (a.age > b.age) return 1;<\/p>\n
  return 0;<\/p>\n
});<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u4e0a\u8ff0\u4ee3\u7801\u7247\u6bb5\u4e2d\uff0cif (a.age < b.age) return -1;<\/code>\u786e\u4fdd\u4e86\u5e74\u9f84\u8f83\u5c0f\u7684\u4eba\u5c06\u88ab\u6392\u5728\u5e74\u9f84\u8f83\u5927\u7684\u4eba\u524d\u9762\u3002<\/p>\n<\/p>\n
\u56db\u3001\u9519\u8bef\u5904\u7406\u548c\u65e9\u671f\u8fd4\u56de<\/h3>\n<\/p>\n
\u5728\u4e00\u4e9b\u51fd\u6570\u7684\u9519\u8bef\u5904\u7406\u903b\u8f91\u4e2d\uff0creturn -1<\/code>\u4e5f\u53ef\u4ee5\u7528\u4f5c\u63d0\u793a\u67d0\u79cd\u9519\u8bef\u6216\u5f02\u5e38\u60c5\u51b5\u7684\u65b9\u5f0f\u3002\u540c\u65f6\uff0c\u5728\u9700\u8981\u4ece\u51fd\u6570\u4e2d\u63d0\u524d\u9000\u51fa\u7684\u573a\u666f\u4e0b\uff0creturn -1<\/code>\u53ef\u4ee5\u7528\u6765\u6307\u793a\u672a\u8fbe\u5230\u6b63\u5e38\u6267\u884c\u7684\u7ed3\u675f\u6761\u4ef6\u3002<\/p>\n<\/p>\n
\u6bd4\u5982\uff0c\u5728\u5904\u7406\u4e00\u4e9b\u9700\u8981\u9884\u6761\u4ef6\u7684\u51fd\u6570\u65f6\uff0c\u5982\u679c\u9884\u6761\u4ef6\u672a\u88ab\u6ee1\u8db3\uff0c\u53ef\u4ee5\u4f7f\u7528return -1<\/code>\u6765\u65e9\u671f\u8fd4\u56de\uff0c\u907f\u514d\u6267\u884c\u66f4\u591a\u7684\u903b\u8f91\uff1a<\/p>\n<\/p>\n
function processData(data) {<\/p>\n
  if (!data.isValid) return -1;<\/p>\n
  \/\/ \u5904\u7406\u6570\u636e\u7684\u903b\u8f91...<\/p>\n
}<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u8fd9\u6837\u7684\u7528\u6cd5\u63d0\u5347\u4e86\u4ee3\u7801\u7684\u53ef\u8bfb\u6027\u548c\u7ef4\u62a4\u6027\uff0c\u4f7f\u5f97\u9519\u8bef\u5904\u7406\u548c\u5f02\u5e38\u60c5\u51b5\u7684\u7ba1\u7406\u66f4\u52a0\u6e05\u6670\u3002<\/p>\n<\/p>\n
\u603b\u7684\u6765\u8bf4\uff0creturn -1<\/code>\u5728JavaScript\u4e2d\u662f\u4e00\u4e2a\u591a\u7528\u9014\u4e14\u91cd\u8981\u7684\u8fd4\u56de\u503c\uff0c\u5b83\u7684\u5e94\u7528\u8303\u56f4\u4ece\u6570\u7ec4\u548c\u5b57\u7b26\u4e32\u7684\u641c\u7d22\u3001\u6392\u5e8f\uff0c\u5230\u590d\u6742\u903b\u8f91\u7684\u9519\u8bef\u5904\u7406\u7b49\u591a\u4e2a\u9886\u57df\u3002\u7406\u89e3\u5b83\u7684\u542b\u4e49\u548c\u7528\u6cd5\uff0c\u5bf9\u4e8e\u5199\u51fa\u9ad8\u8d28\u91cf\u7684JavaScript\u4ee3\u7801\u81f3\u5173\u91cd\u8981\u3002<\/p>\n<\/p>\n
\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n
1. \u5728JavaScript\u4e2d\uff0creturn -1\u7684\u542b\u4e49\u662f\u4ec0\u4e48\uff1f\u5982\u4f55\u7406\u89e3\u8fd9\u4e2a\u8fd4\u56de\u503c\uff1f<\/strong><\/p>\n
\u5728JavaScript\u4e2d\uff0creturn -1\u901a\u5e38\u7528\u4e8e\u8868\u793a\u67d0\u4e2a\u64cd\u4f5c\u6216\u51fd\u6570\u6267\u884c\u5931\u8d25\u6216\u672a\u627e\u5230\u5339\u914d\u9879\u3002\u5b83\u4e00\u822c\u7528\u4f5c\u8fd4\u56de\u503c\u6765\u6307\u793a\u67d0\u4e2a\u7279\u5b9a\u6761\u4ef6\u6216\u72b6\u6001\u3002\u4f8b\u5982\uff0c\u5f53\u4f7f\u7528indexOf\u65b9\u6cd5\u5728\u6570\u7ec4\u4e2d\u67e5\u627e\u67d0\u4e2a\u5143\u7d20\u65f6\uff0c\u5982\u679c\u672a\u627e\u5230\u5339\u914d\u9879\uff0c\u5219\u8fd4\u56de-1\u3002<\/p>\n
\u7406\u89e3\u8fd9\u4e2a\u8fd4\u56de\u503c\u53ef\u4ee5\u8ba9\u6211\u4eec\u66f4\u597d\u5730\u5904\u7406\u7a0b\u5e8f\u4e2d\u7684\u9519\u8bef\u548c\u5f02\u5e38\u60c5\u51b5\u3002\u901a\u8fc7\u5728\u4ee3\u7801\u4e2d\u4f7f\u7528-1\u4f5c\u4e3a\u7279\u6b8a\u8fd4\u56de\u503c\u6765\u8868\u793a\u5931\u8d25\uff0c\u6211\u4eec\u53ef\u4ee5\u6839\u636e\u8fd9\u4e2a\u503c\u6765\u91c7\u53d6\u4e0d\u540c\u7684\u5904\u7406\u65b9\u5f0f\uff0c\u6bd4\u5982\u663e\u793a\u9519\u8bef\u6d88\u606f\uff0c\u8c03\u7528\u5907\u7528\u51fd\u6570\uff0c\u6216\u6267\u884c\u5176\u4ed6\u5fc5\u8981\u7684\u64cd\u4f5c\u3002<\/p>\n
2. return -1\u5728JavaScript\u4e2d\u5e38\u7528\u4e8e\u4ec0\u4e48\u573a\u666f\uff1f\u6709\u4ec0\u4e48\u5b9e\u9645\u5e94\u7528\u6848\u4f8b\uff1f<\/strong><\/p>\n
return -1\u5728JavaScript\u4e2d\u5e38\u7528\u4e8e\u641c\u7d22\u3001\u67e5\u627e\u6216\u5224\u65ad\u67d0\u4e2a\u64cd\u4f5c\u7684\u7ed3\u679c\u3002\u4f8b\u5982\uff0c\u5f53\u6211\u4eec\u5728\u4e00\u4e2a\u6570\u7ec4\u4e2d\u67e5\u627e\u67d0\u4e2a\u5143\u7d20\u65f6\uff0c\u5982\u679c\u672a\u627e\u5230\u5219\u8fd4\u56de-1\u3002\u8fd9\u6837\u5c31\u80fd\u65b9\u4fbf\u5730\u5224\u65ad\u67e5\u627e\u7684\u7ed3\u679c\uff0c\u5e76\u8fdb\u884c\u76f8\u5e94\u7684\u5904\u7406\u3002<\/p>\n
\u5b9e\u9645\u5e94\u7528\u6848\u4f8b\u5305\u62ec\uff1a<\/p>\n
    \n
  • \u5728\u4e00\u4e2a\u7528\u6237\u5217\u8868\u4e2d\uff0c\u901a\u8fc7\u7528\u6237ID\u67e5\u627e\u7528\u6237\u7684\u529f\u80fd\u3002\u5982\u679c\u672a\u627e\u5230\u5bf9\u5e94\u7684\u7528\u6237ID\uff0c\u5219\u8fd4\u56de-1\uff0c\u63d0\u793a\u7528\u6237\u4e0d\u5b58\u5728\u3002<\/li>\n
  • \u5728\u4e00\u4e2a\u5b57\u7b26\u4e32\u4e2d\u641c\u7d22\u7279\u5b9a\u7684\u5355\u8bcd\u6216\u5b57\u7b26\u3002\u5982\u679c\u672a\u627e\u5230\uff0c\u8fd4\u56de-1\uff0c\u7528\u4e8e\u5904\u7406\u4e0d\u5b58\u5728\u7684\u60c5\u51b5\u3002<\/li>\n
  • \u5728\u4e00\u4e2a\u6570\u636e\u96c6\u5408\u4e2d\u5339\u914d\u7279\u5b9a\u7684\u6761\u4ef6\u3002\u5982\u679c\u672a\u627e\u5230\u7b26\u5408\u6761\u4ef6\u7684\u9879\uff0c\u5219\u8fd4\u56de-1\u3002<\/li>\n<\/ul>\n
    3. \u5982\u4f55\u5728JavaScript\u4e2d\u5904\u7406return -1\u7684\u8fd4\u56de\u503c\uff1f\u6709\u4ec0\u4e48\u5e38\u89c1\u7684\u5904\u7406\u65b9\u5f0f\uff1f<\/strong><\/p>\n
    \u5904\u7406return -1\u7684\u8fd4\u56de\u503c\u9700\u8981\u6839\u636e\u5177\u4f53\u7684\u5e94\u7528\u573a\u666f\u548c\u9700\u6c42\u91c7\u53d6\u4e0d\u540c\u7684\u5904\u7406\u65b9\u5f0f\u3002\u5e38\u89c1\u7684\u5904\u7406\u65b9\u5f0f\u5305\u62ec\uff1a<\/p>\n
      \n
    • \n
      \u663e\u793a\u9519\u8bef\u4fe1\u606f\uff1a\u5c06-1\u4f5c\u4e3a\u7279\u6b8a\u8fd4\u56de\u503c\uff0c\u8868\u793a\u64cd\u4f5c\u6216\u51fd\u6570\u6267\u884c\u5931\u8d25\uff0c\u53ef\u4ee5\u5728\u7528\u6237\u754c\u9762\u4e0a\u663e\u793a\u76f8\u5e94\u7684\u9519\u8bef\u63d0\u793a\u4fe1\u606f\uff0c\u6bd4\u5982\u201c\u672a\u627e\u5230\u5339\u914d\u9879\u201d\u6216\u201c\u64cd\u4f5c\u5931\u8d25\uff0c\u8bf7\u91cd\u8bd5\u201d\u3002<\/p>\n<\/li>\n
    • \n
      \u8c03\u7528\u5907\u7528\u51fd\u6570\uff1a\u5f53\u67d0\u4e2a\u64cd\u4f5c\u6216\u51fd\u6570\u8fd4\u56de-1\u65f6\uff0c\u53ef\u4ee5\u5c1d\u8bd5\u8c03\u7528\u5907\u7528\u51fd\u6570\u8fdb\u884c\u5904\u7406\uff0c\u4ee5\u63d0\u4f9b\u5907\u9009\u65b9\u6848\u6216\u8865\u6551\u63aa\u65bd\u3002<\/p>\n<\/li>\n
    • \n
      \u8fd4\u56de\u9ed8\u8ba4\u503c\uff1a\u5982\u679c\u67d0\u4e2a\u64cd\u4f5c\u6216\u51fd\u6570\u8fd4\u56de-1\uff0c\u53ef\u4ee5\u6839\u636e\u9700\u8981\u6307\u5b9a\u4e00\u4e2a\u9ed8\u8ba4\u503c\u4f5c\u4e3a\u66ff\u4ee3\u3002\u8fd9\u6837\u53ef\u4ee5\u786e\u4fdd\u7a0b\u5e8f\u7ee7\u7eed\u6b63\u5e38\u8fd0\u884c\uff0c\u907f\u514d\u56e0\u4e3a-1\u800c\u5bfc\u81f4\u7684\u9519\u8bef\u3002<\/p>\n<\/li>\n<\/ul>\n
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