JavaScript 流程控制语句：break、continue 和 return - 详细指南

JavaScript\u4e2d\u7684\u6d41\u7a0b\u63a7\u5236\u8bed\u53e5\u5305\u62ecbreak\u3001continue\u548creturn\u3002\n\n1\u3002break\u8bed\u53e5\u7528\u4e8e\u7ec8\u6b62\u73b0\u5728\u5faa\u73af\u6216switch\u8bed\u53e5\uff0c\u5e76\u8df3\u51fa\u5faa\u73af\u6216switch\u8bed\u53e5\u7684\u4ee3\u7801\u5757\u3002\u5f53break\u8bed\u53e5\u6267\u884c\u65f6\uff0c\u7a0b\u5e8f\u5c06\u7acb\u5373\u9000\u51fa\u73b0\u5728\u5faa\u73af\u6216switch\u8bed\u53e5\uff0c\u5e76\u7ee7\u7eed\u6267\u884c\u540e\u7eed\u7684\u4ee3\u7801\u3002\u4f8b\u5982\uff1a\n\n\nfor\u00a0(var\u00a0i\u00a0=\u00a00;\u00a0i\u00a0<\u00a010;\u00a0i++)\u00a0{\n\u00a0if\u00a0(i\u00a0===\u00a05)\u00a0{\n\u00a0\u00a0break;\n\u00a0}\n\u00a0console.log(i);\n}\n\n\u5728\u4e0a\u9762\u7684\u4f8b\u5b50\u4e2d\uff0c\u5f53i\u7b49\u4e8e5\u65f6\uff0cbreak\u8bed\u53e5\u88ab\u6267\u884c\uff0c\u5faa\u73af\u88ab\u7ec8\u6b62\uff0c\u7a0b\u5e8f\u8df3\u51fa\u5faa\u73af\u5e76\u7ee7\u7eed\u6267\u884c\u540e\u7eed\u7684\u4ee3\u7801\u3002\n\n2\u3002continue\u8bed\u53e5\u7528\u4e8e\u8df3\u8fc7\u73b0\u5728\u5faa\u73af\u4e2d\u7684\u5269\u4f59\u4ee3\u7801\uff0c\u76f4\u63a5\u8fdb\u5165\u4e0b\u4e00\u6b21\u5faa\u73af\u7684\u8f6c\u6298\u3002\u5f53continue\u8bed\u53e5\u6267\u884c\u65f6\uff0c\u7a0b\u5e8f\u5c06\u8df3\u8fc7continue\u8bed\u53e5\u4ee5\u540e\u7684\u4ee3\u7801\uff0c\u5e76\u5f00\u59cb\u4e0b\u4e00\u6b21\u5faa\u73af\u3002\u4f8b\u5982\uff1a\n\n\nfor\u00a0(var\u00a0i\u00a0=\u00a00;\u00a0i\u00a0<\u00a010;\u00a0i++)\u00a0{\n\u00a0if\u00a0(i\u00a0===\u00a05)\u00a0{\n\u00a0\u00a0continue;\n\u00a0}\n\u00a0console.log(i);\n}\n\n\u5728\u4e0a\u9762\u7684\u4f8b\u5b50\u4e2d\uff0c\u5f53i\u7b49\u4e8e5\u65f6\uff0ccontinue\u8bed\u53e5\u88ab\u6267\u884c\uff0c\u5faa\u73af\u4e2d\u7684console.log(i)\u8bed\u53e5\u5c06\u88ab\u8df3\u8fc7\uff0c\u7a0b\u5e8f\u5f00\u59cb\u4e0b\u4e00\u6b21\u5faa\u73af\u3002\n\n3\u3002return\u8bed\u53e5\u7528\u4e8e\u4ece\u51fd\u6570\u4e2d\u8fd4\u56de\u4e00\u4e2a\u503c\uff0c\u5e76\u7ec8\u6b62\u51fd\u6570\u7684\u6267\u884c\u3002\u5f53return\u8bed\u53e5\u6267\u884c\u65f6\uff0c\u51fd\u6570\u5c06\u7acb\u5373\u505c\u6b62\u6267\u884c\uff0c\u5e76\u5c06\u6307\u5b9a\u7684\u503c\u4f5c\u4e3a\u51fd\u6570\u7684\u8fd4\u56de\u503c\u3002\u4f8b\u5982\uff1a\n\n\nfunction\u00a0add(a,\u00a0b)\u00a0{\n\u00a0return\u00a0a\u00a0+\u00a0b;\n}\n\nvar\u00a0result\u00a0=\u00a0add(3,\u00a05);\nconsole.log(result);\n\n\u5728\u4e0a\u9762\u7684\u4f8b\u5b50\u4e2d\uff0c\u51fd\u6570add\u63a5\u6536\u4e24\u4e2a\u53c2\u6570a\u548c\u00a0b\uff0c\u5e76\u8fd4\u56de\u5b89\u5168\u7684\u503c\u3002\u5f53add\u51fd\u6570\u88ab\u8c03\u7528\u65f6\uff0creturn\u8bed\u53e5\u4f1a\u5c06a\u548c\u00a0b\u7684\u548c\u4f5c\u4e3a\u51fd\u6570\u7684\u8fd4\u56de\u503c\uff0c\u8d4b\u503c\u7ed9result\u53d8\u91cf\uff0c\u5e76\u5728\u63a7\u5236\u53f0\u8f93\u51fa\u7ed3\u679c\u3002