{"id":58,"date":"2023-03-02T22:22:02","date_gmt":"2023-07-29T09:48:12","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/index.php\/2023\/11\/30\/%e5%a6%82%e4%bd%95%e5%9c%a8javascript%e4%b8%ad%e8%a7%a3%e5%86%b3referenceerror%ef%bc%8csyntaxerror%e5%92%8ctypeerror%e9%97%ae%e9%a2%98\/"},"modified":"2025-07-31T22:12:18","modified_gmt":"2025-07-31T14:12:18","slug":"%e5%a6%82%e4%bd%95%e5%9c%a8javascript%e4%b8%ad%e8%a7%a3%e5%86%b3referenceerror%ef%bc%8csyntaxerror%e5%92%8ctypeerror%e9%97%ae%e9%a2%98","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%a6%82%e4%bd%95%e5%9c%a8javascript%e4%b8%ad%e8%a7%a3%e5%86%b3referenceerror%ef%bc%8csyntaxerror%e5%92%8ctypeerror%e9%97%ae%e9%a2%98\/","title":{"rendered":"JavaScript\u5e38\u89c1\u9519\u8bef\uff1aReferenceError\u3001SyntaxError\u548cTypeError\u7684\u8bca\u65ad\u4e0e\u89e3\u51b3"},"content":{"rendered":"

\u5f15\u8a00<\/h3>\n

JavaScript \u662f\u4e00\u79cd\u7528\u4e8e\u524d\u7aef\u548c\u540e\u7aef\u5f00\u53d1\u7684\u7f16\u7a0b\u8bed\u8a00\u3002\u5728\u4f7f\u7528 JavaScript \u65f6\uff0c\u89e3\u8bfb\u9519\u8bef\u6d88\u606f\u53ef\u80fd\u4f1a\u611f\u89c9\u6709\u70b9\u4ee4\u4eba\u671b\u800c\u751f\u754f\u3002\u5f53\u60a8\u5728\u5e94\u7528\u7a0b\u5e8f\u4e2d\u89e3\u51b3\u95ee\u9898\u65f6\uff0c\u7406\u89e3\u9519\u8bef\u6d88\u606f\u6240\u6307\u7684\u5185\u5bb9\u975e\u5e38\u91cd\u8981\u3002\u5e78\u8fd0\u7684\u662f\uff0c\u73b0\u4ee3\u6d4f\u89c8\u5668\u90fd\u9644\u5e26\u4e86\u5185\u7f6e\u7684\u8c03\u8bd5\u5de5\u5177\u6765\u5e2e\u52a9\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\u3002\u6bcf\u4e2a\u6d4f\u89c8\u5668\u5728\u53ef\u89c6\u5316\u8868\u793a\u65b9\u9762\u5904\u7406\u9519\u8bef\u6d88\u606f\u7684\u65b9\u5f0f\u90fd\u4e0d\u540c\u3002\u7136\u800c\uff0c\u9519\u8bef\u6d88\u606f\u80fd\u591f\u8ba9\u60a8\u4e86\u89e3\u5230\u60a8\u7684 JavaScript \u4ee3\u7801\u53d1\u751f\u4e86\u4ec0\u4e48\u3002<\/p>\n

\u5728\u672c\u6559\u7a0b\u4e2d\uff0c\u60a8\u5c06\u5b66\u4e60\u5173\u4e8e\u6d4f\u89c8\u5668\u73af\u5883\u4e0b\u51fa\u73b0\u7684\u4e09\u79cd\u5e38\u89c1\u7684 JavaScript \u9519\u8bef\u7c7b\u578b\uff1aReferenceError\uff08\u5f15\u7528\u9519\u8bef\uff09\u3001SyntaxError\uff08\u8bed\u6cd5\u9519\u8bef\uff09\u548c TypeError\uff08\u7c7b\u578b\u9519\u8bef\uff09\u3002\u4e3a\u4e86\u8ddf\u4e0a\uff0c\u8bf7\u786e\u4fdd\u60a8\u5bf9 JavaScript \u548c\u5f00\u53d1\u8005\u63a7\u5236\u53f0\u6709\u4e00\u5b9a\u7684\u7406\u89e3\u3002<\/p>\n

\u60a8\u53ef\u4ee5\u901a\u8fc7\u6211\u4eec\u7684 JavaScript \u7f16\u7801\u6559\u7a0b<\/a> \u4e86\u89e3\u66f4\u591a\u5173\u4e8e JavaScript \u7684\u77e5\u8bc6\uff0c\u901a\u8fc7\u6211\u4eec\u7684 JavaScript \u5f00\u53d1\u8005\u63a7\u5236\u53f0\u6559\u7a0b<\/a> \u4e86\u89e3\u5173\u4e8e\u5f00\u53d1\u8005\u63a7\u5236\u53f0\u7684\u4f7f\u7528\u65b9\u6cd5\u3002<\/p>\n

\u4ee5\u4e0b\u793a\u4f8b\u5e76\u975e\u8be6\u5c3d\u65e0\u9057\uff0c\u53ea\u662f\u5bf9\u60a8\u53ef\u80fd\u9047\u5230\u7684\u5e38\u89c1\u9519\u8bef\u6d88\u606f\u8fdb\u884c\u521d\u6b65\u4ecb\u7ecd\u3002\u6b64\u5916\uff0c\u793a\u4f8b\u4e2d\u7684\u9519\u8bef\u6d88\u606f\u6765\u81ea Chrome \u7f51\u9875\u6d4f\u89c8\u5668\u3002\u60a8\u5728 Firefox \u6216 Edge \u4e0a\u6536\u5230\u7684\u9519\u8bef\u6d88\u606f\u53ef\u80fd\u7565\u6709\u4e0d\u540c\uff0c\u4f46\u9519\u8bef\u7c7b\u578b\u662f\u76f8\u540c\u7684\u3002<\/p>\n

\u7406\u89e3 JavaScript \u9519\u8bef\u7c7b\u578b<\/h2>\n

JavaScript \u4e2d\u7684\u9519\u8bef\u57fa\u4e8e Error<\/code> \u5bf9\u8c61\u3002\u5b83\u662f\u4e00\u4e2a\u5185\u7f6e\u5bf9\u8c61\uff0c\u5305\u542b\u5173\u4e8e\u53d1\u751f\u7684\u9519\u8bef\u7c7b\u578b\u7684\u4fe1\u606f\uff0c\u7136\u540e\u662f\u8be6\u7ec6\u8bf4\u660e\u53ef\u80fd\u539f\u56e0\u7684\u6d88\u606f\u3002\u4f8b\u5982\uff0c\u60a8\u53ef\u80fd\u9047\u5230\u4e00\u4e2a\u7c7b\u4f3c\u4ee5\u4e0b\u7684\u9519\u8bef\uff1a<\/p>\n

VM170:1 Uncaught ReferenceError: shark is not defined\r\n    at <anonymous>:1:1\r\n<\/code><\/pre>\n
\u5982\u679c\u60a8\u5bf9\u8fd9\u4e2a\u9519\u8bef\u4fe1\u606f\u8fdb\u884c\u89e3\u6784\uff0c\u60a8\u4f1a\u53d1\u73b0 ReferenceError<\/code> \u662f\u88ab\u8bc6\u522b\u51fa\u6765\u7684\u9519\u8bef\u7c7b\u578b\u3002\u5206\u53f7\u540e\u7684\u9519\u8bef\u4fe1\u606f\u63cf\u8ff0\u4e86\u9519\u8bef\uff1ashark<\/code> \u672a\u5b9a\u4e49\u3002\u6b64\u4fe1\u606f\u7684\u6700\u540e\u4e00\u884c\u8be6\u7ec6\u8bf4\u660e\u4e86\u9519\u8bef\u5728\u60a8\u7684\u4ee3\u7801 1:1 \u5904\u53d1\u751f\u3002<\/p>\n
\u6bcf\u5f53\u6d4f\u89c8\u5668\u6355\u83b7\u5230\u9519\u8bef\u65f6\uff0c\u9519\u8bef\u7684\u7c7b\u578b\u548c\u6d88\u606f\u4f1a\u6307\u793a\u95ee\u9898\u6240\u5728\u3002\u901a\u8fc7\u8fd9\u4e9b\u4fe1\u606f\uff0c\u60a8\u53ef\u4ee5\u6839\u636e\u63a5\u6536\u5230\u7684\u9519\u8bef\u7c7b\u578b\u548c\u6d88\u606f\u6765\u786e\u5b9a\u5982\u4f55\u8c03\u8bd5\u4ee3\u7801\u3002<\/p>\n
\u7406\u89e3 ReferenceError<\/h2>\n
\u5f53\u60a8\u5c1d\u8bd5\u8bbf\u95ee\u5c1a\u672a\u521b\u5efa\u7684\u53d8\u91cf\u65f6\uff0c\u4f1a\u53d1\u751f\u4e00\u4e2a\u201c\u5f15\u7528\u9519\u8bef\u201d\u3002\u5b83\u8fd8\u4f1a\u5728\u521d\u59cb\u5316\u53d8\u91cf\u4e4b\u524d\u8c03\u7528\u53d8\u91cf\u65f6\u53d1\u751f\u3002<\/p>\n
\u9047\u5230\u672a\u5b9a\u4e49\u7684\u53d8\u91cf<\/h3>\n
\u4f8b\u5982\uff0c\u5982\u679c\u60a8\u5728\u6267\u884c console.log()<\/code> \u65f6\u62fc\u5199\u53d8\u91cf\u540d\u79f0\u9519\u8bef\uff0c\u60a8\u5c06\u6536\u5230\u4e00\u4e2a ReferenceError<\/code>\u3002<\/p>\n
let<\/span> sammy =<\/span> 'A Shark dreaming of the cloud.'<\/span>;<\/span>\r\n\r\nconsole.<\/span>log<\/span>(<\/span>sammmy)<\/span>;<\/span>\r\n<\/code><\/pre>\n
\u8f93\u51fa<\/div>\n
Uncaught ReferenceError: sammmy is not defined at <anonymous>:1:13\r\n<\/code><\/pre>\n
\u53d8\u91cf sammmy<\/code>\uff0c\u6709\u4e09\u4e2a m\uff0c\u4e0d\u5b58\u5728\u4e14\u672a\u5b9a\u4e49\u3002\u8981\u89e3\u51b3\u8fd9\u4e2a\u9519\u8bef\uff0c\u60a8\u53ef\u4ee5\u628a\u53d8\u91cf\u66f4\u65b0\u4e3a\u6b63\u786e\u7684\u62fc\u5199\uff0c\u5e76\u518d\u6b21\u8fd0\u884c\u547d\u4ee4\u3002\u5982\u679c\u6210\u529f\uff0c\u5c31\u4e0d\u4f1a\u6536\u5230\u9519\u8bef\u6d88\u606f\u3002\u603b\u4f53\u800c\u8a00\uff0c\u68c0\u67e5\u4ee3\u7801\u4e2d\u7684\u4efb\u4f55\u62fc\u5199\u9519\u8bef\u53ef\u4ee5\u5e2e\u52a9\u907f\u514d\u672a\u5b9a\u4e49\u53d8\u91cf\u7684\u9519\u8bef\u3002<\/p>\n
\u5728\u53d8\u91cf\u88ab\u58f0\u660e\u4e4b\u524d\u8bbf\u95ee<\/h3>\n
\u540c\u6837\uff0c\u5f53\u60a8\u5c1d\u8bd5\u5728\u4ee3\u7801\u4e2d\u8bbf\u95ee\u4e00\u4e2a\u53d8\u91cf\u5728\u5176\u58f0\u660e\u4e4b\u524d\u65f6\uff0c\u53ef\u80fd\u4f1a\u9047\u5230\u4ee5\u4e0b\u9519\u8bef\u3002<\/p>\n
function<\/span> sharkName<\/span>(<\/span>)<\/span> {<\/span>\r\n    console.<\/span>log<\/span>(<\/span>shark)<\/span>;<\/span>\r\n\r\n    let<\/span> shark =<\/span> 'sammy'<\/span>;<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u8f93\u51fa<\/div>\n
VM223:2 Uncaught ReferenceError: Cannot access 'shark' before initialization at sharkName (<anonymous>:2:17) at <anonymous>:1:1\r\n<\/code><\/pre>\n
\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0cconsole.log(shark)<\/code> \u5728 shark<\/code> \u53d8\u91cf\u58f0\u660e\u4e4b\u524d\u88ab\u6267\u884c\uff0c\u8fd9\u5bfc\u81f4\u4e86\u9519\u8bef\u7684\u53d1\u751f\u3002\u4e00\u822c\u6765\u8bf4\uff0c\u5728\u5c1d\u8bd5\u8bbf\u95ee\u53d8\u91cf\u4e4b\u524d\u5148\u58f0\u660e\u53d8\u91cf\u662f\u4e00\u4e2a\u5f88\u597d\u7684\u505a\u6cd5\u3002<\/p>\n
\n
\u6ce8\u610f\uff1a\u7531\u4e8e let<\/code> \u548c const<\/code> \u58f0\u660e\u7684\u5904\u7406\u65b9\u5f0f\uff0c\u8fd9\u4e9b\u58f0\u660e\u5728\u4e0a\u4e00\u4e2a\u793a\u4f8b\u4e2d\u88ab\u63d0\u5347\uff0c\u4f46\u76ee\u524d\u65e0\u6cd5\u8bbf\u95ee\u3002\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0clet<\/code> \u548c const<\/code> \u53d8\u91cf\u8fdb\u5165\u6240\u8c13\u7684\u201c\u6682\u65f6\u6b7b\u533a\u201d\u3002\u4e3a\u4e86\u907f\u514d\u8fd9\u79cd\u60c5\u51b5\uff0c\u8bf7\u5728\u4f5c\u7528\u57df\u7684\u5f00\u59cb\u58f0\u660e\u60a8\u7684 let<\/code> \u548c const<\/code> \u53d8\u91cf\u3002\u4e3a\u4e86\u4fee\u590d\u793a\u4f8b\u4ee3\u7801\uff0c\u8bf7\u5728\u6267\u884c console.log()<\/code> \u547d\u4ee4\u4e4b\u524d\u58f0\u660e shark<\/code> \u53d8\u91cf\u3002<\/p>\n
function<\/span> sharkName<\/span>(<\/span>)<\/span> {<\/span>\r\n    let<\/span> shark =<\/span> 'sammy'<\/span>;<\/span>\r\n\r\n    console.<\/span>log<\/span>(<\/span>shark)<\/span>;<\/span><\/mark>\r\n}<\/span>\r\n<\/code><\/pre>\n<\/div>\n
ReferenceError<\/code> \u7ecf\u5e38\u4e0e\u60a8\u7684\u53d8\u91cf\u548c\u4f5c\u7528\u57df\u76f8\u5173\u8054\u3002\u867d\u7136\u8fd9\u8d85\u51fa\u4e86\u672c\u6559\u7a0b\u7684\u8303\u56f4\uff0c\u4f46\u60a8\u53ef\u4ee5\u5728\u6211\u4eec\u7684\u300a\u7406\u89e3 JavaScript \u4e2d\u7684\u53d8\u91cf\u3001\u4f5c\u7528\u57df\u548c\u63d0\u5347\u300b\u6559\u7a0b\u4e2d\u4e86\u89e3\u66f4\u591a\u5173\u4e8e\u4f5c\u7528\u57df\u3001\u4e0d\u540c\u53d8\u91cf\u7c7b\u578b\u548c\u53d8\u91cf\u63d0\u5347\u7684\u77e5\u8bc6\u3002<\/p>\n
\u7406\u89e3 SyntaxError<\/h2>\n
\u5f53 JavaScript \u89e3\u91ca\u5668\u904d\u5386\u60a8\u7684\u4ee3\u7801\u65f6\uff0c\u5982\u679c\u9047\u5230\u4e0d\u7b26\u5408\u8bed\u8a00\u89c4\u8303\u7684\u4ee3\u7801\uff0c\u5b83\u53ef\u80fd\u4f1a\u629b\u51fa SyntaxError<\/code>\u3002\u5982\u679c\u53d1\u751f\u8fd9\u79cd\u60c5\u51b5\uff0c\u60a8\u7684\u4ee3\u7801\u5c06\u505c\u6b62\u6267\u884c\uff0c\u5e76\u6536\u5230\u6709\u5173\u8bed\u6cd5\u9519\u8bef\u7684\u6d88\u606f\u3002<\/p>\n
\u7f3a\u5931\u7684\u4ee3\u7801\u5c01\u88c5<\/h3>\n
\u4f8b\u5982\uff0c\u5f53\u4f60\u7f16\u5199\u4e00\u4e2a\u51fd\u6570\u65f6\uff0c\u5982\u679c\u5fd8\u8bb0\u7528\u53f3\u62ec\u53f7 “)” \u5305\u88f9\u4ee3\u7801\uff0c\u4f60\u5c06\u6536\u5230\u4e00\u6761\u7279\u5b9a\u7684 SyntaxError \u6d88\u606f\uff0c\u63d0\u793a\u4f60\u7f3a\u5c11\u4e86\u4ec0\u4e48\u3002<\/p>\n
function<\/span> sammy<\/span>(<\/span>animal<\/span>)<\/span> {<\/span>\r\n    if<\/span>(<\/span>animal ==<\/span> 'shark'<\/span>)<\/span>{<\/span>\r\n        return<\/span> `<\/span>I'm cool<\/span>`<\/span><\/span>;<\/span>\r\n    }<\/span> else<\/span> {<\/span>\r\n        return<\/span> `<\/span>You're cool<\/span>`<\/span><\/span>;<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n\r\nsammy<\/span>(<\/span>'shark'<\/span>;<\/span><\/code><\/pre>\n
\u8f93\u51fa<\/div>\n
Uncaught SyntaxError: missing ) after argument list<\/code><\/pre>\n
\u5e78\u8fd0\u7684\u662f\uff0c\u9519\u8bef\u4fe1\u606f\u6307\u660e\u4e86\u4ee3\u7801\u4e2d\u7f3a\u5931\u7684\u5143\u7d20\u3002\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0csammy<\/code> \u51fd\u6570\u8c03\u7528\u7f3a\u5c11\u4e86\u95ed\u5408\u7684 )<\/code> \u62ec\u53f7\u3002<\/p>\n
.<\/span> .<\/span> .<\/span>\r\n\r\nsammy<\/span>(<\/span>'shark'<\/span>)<\/span><\/mark>;<\/span><\/code><\/pre>\n
\u5982\u679c\u5728\u51fd\u6570\u7684\u672b\u5c3e\u7701\u7565\u4e86\u7ed3\u675f\u82b1\u62ec\u53f7 }<\/code>\uff0c\u6216\u8005\u5728\u6570\u7ec4\u4e2d\u7701\u7565\u4e86\u53f3\u65b9\u62ec\u53f7 ]<\/code>\uff0c\u4e5f\u4f1a\u629b\u51fa\u8fd9\u4e2a\u9519\u8bef\u3002\u8bf7\u786e\u4fdd\u6b63\u786e\u5730\u5173\u95ed\u4f60\u7684\u51fd\u6570\u3001\u6570\u7ec4\u548c\u5bf9\u8c61\u3002<\/p>\n
\u58f0\u660e\u76f8\u540c\u7684\u53d8\u91cf\u540d\u79f0<\/h3>\n
\u5f53\u51fd\u6570\u53c2\u6570\u548c\u51fd\u6570\u4f53\u5185\u90e8\u4f7f\u7528\u76f8\u540c\u7684\u53d8\u91cf\u540d\u65f6\uff0c\u60a8\u4e5f\u53ef\u80fd\u4f1a\u9047\u5230\u8fd9\u4e2a\u9519\u8bef\u3002\u8bf7\u770b\u4e0b\u9762\u7684\u4f8b\u5b50\uff1a<\/p>\n
function<\/span> sammy<\/span>(<\/span>animal<\/span><\/mark>)<\/span> {<\/span>\r\n    let<\/span> animal<\/mark> =<\/span> 'shark'<\/span>;<\/span>\r\n}<\/span><\/code><\/pre>\n
\u8f93\u51fa<\/div>\n
VM132:2 Uncaught SyntaxError: Identifier 'animal' has already been declared<\/code><\/pre>\n
\u4e3a\u4e86\u4fee\u590d\u9519\u8bef\uff0c\u8bf7\u786e\u4fdd\u5728\u51fd\u6570\u4f53\u5185\u521b\u5efa\u552f\u4e00\u4e14\u5177\u4f53\u7684\u53d8\u91cf\u540d\u3002\u4f8b\u5982\uff0c\u901a\u8fc7\u58f0\u660e\u4e00\u4e2a\u65b0\u7684\u53d8\u91cf\u540d\uff0c\u6bd4\u5982 animalType<\/code>\uff0c\u4f60\u53ef\u4ee5\u6d88\u9664\u51fd\u6570\u53c2\u6570\u548c\u51fd\u6570\u4f53\u5185 let<\/code> \u53d8\u91cf\u4e4b\u95f4\u7684\u51b2\u7a81\u3002<\/p>\n
function<\/span> sammy<\/span>(<\/span>animal<\/span>)<\/span> {<\/span>\r\n    let<\/span> animalType<\/mark> =<\/span> 'shark'<\/span>;<\/span>\r\n}<\/span><\/code><\/pre>\n
\u5982\u679c\u4f60\u6253\u7b97\u5728\u51fd\u6570\u4f53\u5185\u66f4\u6539\u6216\u4f7f\u7528\u53c2\u6570\uff0c\u8bf7\u4e0d\u8981\u4f7f\u7528\u5177\u6709\u76f8\u540c\u53d8\u91cf\u540d\u7684\u53d8\u91cf\u58f0\u660e\u3002\u4f8b\u5982\uff0c\u4f60\u53ef\u4ee5\u5728\u51fd\u6570\u4f53\u5185\u5220\u9664 let<\/code> \u58f0\u660e\u3002<\/p>\n
function<\/span> sammy<\/span>(<\/span>animal<\/span>)<\/span> {<\/span>\r\n    animal<\/mark> =<\/span> 'shark'<\/span>;<\/span>\r\n}<\/span><\/code><\/pre>\n
\u786e\u4fdd\u5728\u51fd\u6570\u4f53\u5185\u5916\u4f7f\u7528\u53d8\u91cf\u65f6\uff0c\u7ed9\u5b83\u4eec\u8d77\u72ec\u7279\u7684\u540d\u79f0\u3002\u5728\u8bbf\u95ee\u51fd\u6570\u53c2\u6570\u65f6\uff0c\u53ef\u4ee5\u5728\u51fd\u6570\u4f53\u5185\u76f4\u63a5\u4f7f\u7528\u5b83\uff0c\u800c\u65e0\u9700\u50cf let<\/code> \u4e00\u6837\u8fdb\u884c\u53d8\u91cf\u58f0\u660e\u3002<\/p>\n
\u8bc6\u522b\u610f\u5916\u6807\u8bb0<\/h3>\n
\u8fd9\u662f\u6587\u7ae0\u300a\u5982\u4f55\u5728JavaScript\u4e2d\u89e3\u51b3’ReferenceError’\uff0c’SyntaxError’\u548c’TypeError’\u95ee\u9898\u300b\u7684\u7b2c3\u90e8\u5206\uff08\u51715\u90e8\u5206\uff09\u3002<\/p>\n
\u5185\u5bb9\u7247\u6bb5: \u5c31\u50cf\u5fd8\u8bb0\u4e86\u4e00\u4e2a\u62ec\u53f7 `]` \u6216\u8005\u4e00\u4e2a\u82b1\u62ec\u53f7 `}` \u4e00\u6837\uff0c\u6709\u65f6\u4f60\u53ef\u80fd\u9700\u8981\u5bf9\u4f60\u7684\u4ee3\u7801\u8fdb\u884c\u4e00\u4e2a\u5fae\u5c0f\u4f46\u5173\u952e\u7684\u6dfb\u52a0\u3002\u4f8b\u5982\uff1a<\/p>\n
let<\/span> sharkCount =<\/span> 0<\/span>;<\/span>\r\n\r\nfunction<\/span> sammy<\/span>(<\/span>)<\/span> {<\/span>\r\n    sharkCount+<\/span>;<\/span>\r\n    console.<\/span>log<\/span>(<\/span>sharkCount)<\/span>;<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u8f93\u51fa<\/div>\n
Uncaught SyntaxError: Unexpected token ';'<\/code><\/pre>\n
\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0c\u591a\u4f59\u7684\u5143\u7d20\u662f\u51fd\u6570\u4f53\u5185\u7684 `sharkCount` \u540e\u9762\u7684\u52a0\u53f7\u3002\u6b63\u786e\u7684\u81ea\u589e\u64cd\u4f5c\u7b26\u5e94\u8be5\u662f `++`\u3002<\/p>\n
.<\/span> .<\/span> .<\/span>\r\nfunction<\/span> sammy<\/span>(<\/span>)<\/span> {<\/span>\r\n    sharkCount++<\/span>;<\/span>\r\n    console.<\/span>log<\/span>(<\/span>sharkCount)<\/span>;<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u5f53\u9047\u5230\u201c`SyntaxError: Unexpected token`\u201d\u65f6\uff0c\u8bf7\u4ed4\u7ec6\u68c0\u67e5\u4f60\u7684\u4ee3\u7801\u662f\u5426\u7f3a\u5c11\u6216\u591a\u4f59\u4e86\u50cf\u52a0\u53f7\uff08`+`\uff09\u8fd9\u6837\u7684\u64cd\u4f5c\u7b26\u3002<\/p>\n
\u7406\u89e3 TypeError\uff08\u7c7b\u578b\u9519\u8bef\uff09<\/h2>\n
\u5f53\u51fd\u6570\u6216\u53d8\u91cf\u7684\u503c\u662f\u610f\u5916\u7c7b\u578b\u65f6\uff0c\u4f1a\u53d1\u751f\u7c7b\u578b\u9519\u8bef\uff08`TypeError`\uff09\u3002\u60a8\u53ef\u4ee5\u901a\u8fc7\u67e5\u9605\u6211\u4eec\u7684\u300a\u4e86\u89e3JavaScript\u6570\u636e\u7c7b\u578b\u300b\u6559\u7a0b\uff0c\u66f4\u591a\u4e86\u89e3\u4e0d\u540c\u7684JavaScript\u6570\u636e\u7c7b\u578b\u3002<\/p>\n
\u5728\u5bf9\u8c61\u4e0a\u4f7f\u7528\u6570\u7ec4\u65b9\u6cd5<\/h3>\n
\u4e00\u4e2a\u5e38\u89c1\u7684\u9519\u8bef\u662f\u4f7f\u7528\u6570\u7ec4\u65b9\u6cd5\u6765\u904d\u5386\u5bf9\u8c61\u3002\u4f8b\u5982\uff0c\u60a8\u4e0d\u80fd\u4f7f\u7528 `.map()` \u65b9\u6cd5\u6765\u5faa\u73af\u904d\u5386\u5bf9\u8c61\uff0c\u56e0\u4e3a\u8be5\u65b9\u6cd5\u53ea\u9002\u7528\u4e8e\u6570\u7ec4\u3002<\/p>\n
const<\/span> sharks =<\/span> {<\/span>\r\n    shark1<\/span>:<\/span> 'sammy'<\/span>,<\/span>\r\n    shark2<\/span>:<\/span> 'shelly'<\/span>,<\/span>\r\n    shark3<\/span>:<\/span> 'sheldon'<\/span>\r\n}<\/span>\r\n\r\nsharks.<\/span>map<\/span>(<\/span>(<\/span>shark<\/span>)<\/span> =><\/span> `<\/span>Hello there <\/span>${<\/span>shark}<\/span><\/span>!<\/span>`<\/span><\/span>)<\/span>;<\/span>\r\n<\/code><\/pre>\n
\u8f93\u51fa<\/div>\n
\u8fd9\u662f\u6587\u7ae0\u300a\u5982\u4f55\u5728JavaScript\u4e2d\u89e3\u51b3’ReferenceError’\uff0c’SyntaxError’\u548c’TypeError’\u95ee\u9898\u300b\u7684\u7b2c4\u90e8\u5206\uff08\u51715\u90e8\u5206\uff09\u3002<\/p>\n
<\/code><\/pre>\n
Uncaught TypeError: sharks.map is not a function at <anonymous>:1:8<\/code><\/p>\n
<\/code><\/pre>\n
\u4fee\u590d\u4e0a\u4e00\u4e2a\u4f8b\u5b50\u7684\u4e00\u79cd\u65b9\u6cd5\u662f\u4f7f\u7528for...in<\/code>\u5faa\u73af\uff0c\u5728sharks<\/code>\u5bf9\u8c61\u4e0a\u5de5\u4f5c\uff0c\u4ee5\u83b7\u53d6\u503c\uff1a<\/p>\n
const<\/span> sharks =<\/span> {<\/span>\r\n    shark1<\/span>:<\/span> 'sammy'<\/span>,<\/span>\r\n    shark2<\/span>:<\/span> 'shelly'<\/span>,<\/span>\r\n    shark3<\/span>:<\/span> 'sheldon'<\/span>\r\n}<\/span>\r\n\r\nfor<\/span> (<\/span>let<\/span> key in<\/span> sharks)<\/span> {<\/mark>\r\n    console.<\/span>log<\/span>(<\/span>`<\/span>\u5927\u5bb6\u597d\uff0c\u6211\u662f <\/span>${<\/span>sharks[<\/span>key]<\/span>}<\/span><\/span>\uff01<\/span>`<\/span><\/span>)<\/span>;<\/span><\/mark>\r\n}<\/span><\/mark>\r\n<\/code><\/pre>\n
\u6216\u8005\uff0c\u4f60\u53ef\u4ee5\u5c06sharks<\/code>\u5bf9\u8c61\u8f6c\u6362\u4e3a\u6570\u7ec4\uff0c\u4ee5\u4fbf\u4f7f\u7528.map()<\/code>\u65b9\u6cd5\uff1a<\/p>\n
const<\/span> sharks =<\/span> [<\/span>'sammy'<\/span>,<\/span> 'shelly'<\/span>,<\/span> 'sheldon'<\/span>]<\/span>;<\/span>\r\n\r\nsharks.<\/span>map<\/span>(<\/span>(<\/span>shark<\/span>)<\/span> =><\/span> `<\/span>\u5927\u5bb6\u597d\uff0c\u6211\u662f <\/span>${<\/span>shark}<\/span><\/span>\uff01<\/span>`<\/span><\/span>)<\/span>;<\/span>\r\n<\/code><\/pre>\n
\u5f53\u4f60\u5904\u7406\u4e0d\u540c\u7684\u6570\u7ec4\u548c\u5bf9\u8c61\u65f6\uff0c\u5f88\u5bb9\u6613\u6df7\u6dc6\u5404\u79cd\u65b9\u6cd5\u3002\u8bf7\u4ed4\u7ec6\u6838\u67e5\u4f60\u4f7f\u7528\u7684\u65b9\u6cd5\u662f\u5426\u9002\u7528\u4e8e\u6240\u5904\u7406\u7684\u6570\u636e\u7c7b\u578b\u3002<\/p>\n
\u4f7f\u7528\u6b63\u786e\u7684\u89e3\u6784\u65b9\u6cd5<\/h3>\n
\u540c\u6837\uff0c\u5c1d\u8bd5\u4f7f\u7528\u6570\u7ec4\u89e3\u6784\u6765\u904d\u5386\u4e00\u4e2a\u5bf9\u8c61\u5c06\u629b\u51fa\u4e00\u4e2aTypeError<\/code>\u9519\u8bef\u3002<\/p>\n
const<\/span> shark =<\/span> {<\/span>\r\n    name<\/span>:<\/span> 'sammy'<\/span>,<\/span>\r\n    age<\/span>:<\/span> 12<\/span>,<\/span>\r\n    cloudPlatform<\/span>:<\/span> 'Silicon Cloud'<\/span>\r\n}<\/span>\r\n\r\nconst<\/span> [<\/span>name,<\/span> age,<\/span> cloudPlatform]<\/span> =<\/span> sharks;<\/span>\r\n<\/code><\/pre>\n
<\/code><\/pre>\n
\u8f93\u51fa<\/div>\n
\u8fd9\u662f\u6587\u7ae0\u300a\u5982\u4f55\u5728JavaScript\u4e2d\u89e3\u51b3’ReferenceError’\uff0c’SyntaxError’\u548c’TypeError’\u95ee\u9898\u300b\u7684\u7b2c5\u90e8\u5206\uff08\u51715\u90e8\u5206\uff09\u3002<\/p>\n
<\/code><\/pre>\n
VM23:7 Uncaught TypeError: sharks is not iterable at <anonymous>:7:26<\/code><\/pre>\n
<\/code><\/pre>\n
\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\u7684\u4e00\u79cd\u65b9\u6cd5\u662f\u4f7f\u7528\u5bf9\u8c61\u89e3\u6784\u6765\u57fa\u4e8e\u5bf9\u8c61\u7684\u952e\u521b\u5efa\u65b0\u53d8\u91cf\u3002<\/p>\n
const<\/span> shark =<\/span> {<\/span>\r\n    name<\/span>:<\/span> 'sammy'<\/span>,<\/span>\r\n    age<\/span>:<\/span> 12<\/span>,<\/span>\r\n    cloudPlatform<\/span>:<\/span> 'Silicon Cloud'<\/span>\r\n}<\/span>\r\n\r\nconst<\/span> {<\/span>name,<\/span> age,<\/span> cloudPlatform}<\/span> =<\/span> shark;<\/mark>\r\n\r\nconsole.<\/span>log<\/span>(<\/span>name)<\/span>;<\/mark>\r\n<\/code><\/pre>\n
<\/code><\/pre>\n
\u8f93\u51fa<\/div>\n
sammy<\/code><\/pre>\n
<\/code><\/pre>\n
\u6839\u636e\u60a8\u7684\u6570\u636e\u7ed3\u6784\u662f\u4f7f\u7528\u6570\u7ec4\u8fd8\u662f\u5bf9\u8c61\uff0c\u8bf7\u786e\u4fdd\u4f7f\u7528\u9002\u5f53\u7684\u65b9\u6cd5\u6765\u83b7\u53d6\u503c\u3002<\/p>\n
\u7ed3\u8bba<\/h2>\n
\u5728\u672c\u6559\u7a0b\u4e2d\uff0c\u60a8\u5b66\u4e60\u4e86\u5173\u4e8e\u4e09\u79cd\u5e38\u89c1\u7684JavaScript\u9519\u8bef\u7c7b\u578b\uff0c\u4ee5\u53ca\u5b83\u4eec\u76f8\u5173\u7684\u6d88\u606f\u548c\u5982\u4f55\u5728\u9047\u5230\u5e38\u89c1\u95ee\u9898\u65f6\u8fdb\u884c\u8c03\u8bd5\u7684\u5185\u5bb9\u3002\u867d\u7136\u672c\u6587\u5e76\u975e\u5305\u7f57\u4e07\u8c61\uff0c\u4f46\u60a8\u5df2\u7ecf\u83b7\u5f97\u4e86\u5173\u4e8eJavaScript\u548c\u6d4f\u89c8\u5668\u5982\u4f55\u5171\u540c\u6307\u793a\u4ee3\u7801\u4e2d\u95ee\u9898\u7684\u89c1\u89e3\u3002<\/p>\n
\u60a8\u53ef\u4ee5\u4e86\u89e3\u66f4\u591a\u5173\u4e8e\u5982\u4f55\u4f7f\u7528JavaScript\u5bf9\u8c61\u65b9\u6cd5<\/a>\u548cJavaScript\u6570\u7ec4\u65b9\u6cd5<\/a>\uff0c\u4ee5\u66f4\u597d\u5730\u7406\u89e3\u5982\u4f55\u5e94\u7528\u8fd9\u4e9b\u65b9\u6cd5\u3002<\/p>\n
\u60a8\u8fd8\u53ef\u4ee5\u901a\u8fc7\u6211\u4eec\u7684\u201c\u5982\u4f55\u4f7f\u7528Google Chrome\u5f00\u53d1\u5de5\u5177\u548cVisual Studio Code\u8c03\u8bd5JavaScript<\/a>\u201d\u6559\u7a0b\uff0c\u4e86\u89e3\u66f4\u591a\u5173\u4e8e\u4f7f\u7528Chrome\u5f00\u53d1\u5de5\u5177\u8fdb\u884c\u8c03\u8bd5\u7684\u65b9\u6cd5\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
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