\u89e3\u6784\u6a21\u578b<\/strong><\/div>\n
\u5728\u89e3\u6784\u4e2d\uff0c\u6709\u4e0b\u9762\u4e24\u90e8\u5206\u53c2\u4e0e\uff1a<\/p>\n
\n
\u89e3\u6784\u7684\u6e90\uff0c\u89e3\u6784\u8d4b\u503c\u8868\u8fbe\u5f0f\u7684\u53f3\u8fb9\u90e8\u5206\u3002<\/li>\n
\u89e3\u6784\u7684\u76ee\u6807\uff0c\u89e3\u6784\u8d4b\u503c\u8868\u8fbe\u5f0f\u7684\u5de6\u8fb9\u90e8\u5206\u3002<\/li>\n<\/ol>\n
\u6570\u7ec4\u6a21\u578b\u7684\u89e3\u6784\uff08Array\uff09<\/strong><\/div>\n
\u57fa\u672c<\/strong><\/span><\/div>\n
let [a, b, c] = [1, 2, 3];\r\n\/\/ a = 1\r\n\/\/ b = 2\r\n\/\/ c = 3<\/pre>\n
\u53ef\u5d4c\u5957<\/strong><\/span><\/div>\n
let [a, [[b], c]] = [1, [[2], 3]];\r\n\/\/ a = 1\r\n\/\/ b = 2\r\n\/\/ c = 3<\/pre>\n
\u53ef\u5ffd\u7565<\/strong><\/span><\/div>\n
let [a, , b] = [1, 2, 3];\r\n\/\/ a = 1\r\n\/\/ b = 3<\/pre>\n
\u4e0d\u5b8c\u5168\u89e3\u6784<\/strong><\/span><\/div>\n
let [a = 1, b] = []; \/\/ a = 1, b = undefined<\/pre>\n
\u5269\u4f59\u8fd0\u7b97\u7b26<\/strong><\/span><\/div>\n
let [a, ...b] = [1, 2, 3];\r\n\/\/a = 1\r\n\/\/b = [2, 3]<\/pre>\n
\u5b57\u7b26\u4e32\u7b49<\/strong><\/span><\/div>\n
\u5728\u6570\u7ec4\u7684\u89e3\u6784\u4e2d\uff0c\u89e3\u6784\u7684\u76ee\u6807\u82e5\u4e3a\u53ef\u904d\u5386\u5bf9\u8c61\uff0c\u7686\u53ef\u8fdb\u884c\u89e3\u6784\u8d4b\u503c\u3002\u53ef\u904d\u5386\u5bf9\u8c61\u5373\u5b9e\u73b0 Iterator \u63a5\u53e3\u7684\u6570\u636e\u3002<\/p>\n
let [a, b, c, d, e] = 'hello';\r\n\/\/ a = 'h'\r\n\/\/ b = 'e'\r\n\/\/ c = 'l'\r\n\/\/ d = 'l'\r\n\/\/ e = 'o'<\/pre>\n
\u89e3\u6784\u9ed8\u8ba4\u503c<\/strong><\/span><\/div>\n
let [a = 2] = [undefined]; \/\/ a = 2<\/pre>\n
\u5f53\u89e3\u6784\u6a21\u5f0f\u6709\u5339\u914d\u7ed3\u679c\uff0c\u4e14\u5339\u914d\u7ed3\u679c\u662f undefined \u65f6\uff0c\u4f1a\u89e6\u53d1\u9ed8\u8ba4\u503c\u4f5c\u4e3a\u8fd4\u56de\u7ed3\u679c\u3002<\/p>\n
let [a = 3, b = a] = []; \/\/ a = 3, b = 3\r\nlet [a = 3, b = a] = [1]; \/\/ a = 1, b = 1\r\nlet [a = 3, b = a] = [1, 2]; \/\/ a = 1, b = 2<\/pre>\n
\na \u4e0e b \u5339\u914d\u7ed3\u679c\u4e3a undefined \uff0c\u89e6\u53d1\u9ed8\u8ba4\u503c\uff1aa = 3; b = a =3
\na \u6b63\u5e38\u89e3\u6784\u8d4b\u503c\uff0c\u5339\u914d\u7ed3\u679c\uff1aa = 1\uff0cb \u5339\u914d\u7ed3\u679c undefined \uff0c\u89e6\u53d1\u9ed8\u8ba4\u503c\uff1ab = a =1
\na \u4e0e b \u6b63\u5e38\u89e3\u6784\u8d4b\u503c\uff0c\u5339\u914d\u7ed3\u679c\uff1aa = 1\uff0cb = 2<\/ol>\n
\u5bf9\u8c61\u6a21\u578b\u7684\u89e3\u6784\uff08Object\uff09<\/strong><\/div>\n
\u57fa\u672c<\/strong><\/span><\/div>\n
let { foo, bar } = { foo: 'aaa', bar: 'bbb' };\r\n\/\/ foo = 'aaa'\r\n\/\/ bar = 'bbb'\r\n \r\nlet { baz : foo } = { baz : 'ddd' };\r\n\/\/ foo = 'ddd'<\/pre>\n
\u53ef\u5d4c\u5957\u53ef\u5ffd\u7565<\/strong><\/span><\/div>\n
let obj = {p: ['hello', {y: 'world'}] };\r\nlet {p: [x, { y }] } = obj;\r\n\/\/ x = 'hello'\r\n\/\/ y = 'world'\r\nlet obj = {p: ['hello', {y: 'world'}] };\r\nlet {p: [x, { }] } = obj;\r\n\/\/ x = 'hello'<\/pre>\n
\u4e0d\u5b8c\u5168\u89e3\u6784<\/strong><\/span><\/div>\n
let obj = {p: [{y: 'world'}] };\r\nlet {p: [{ y }, x ] } = obj;\r\n\/\/ x = undefined\r\n\/\/ y = 'world'<\/pre>\n
\u5269\u4f59\u8fd0\u7b97\u7b26<\/strong><\/span><\/div>\n
let {a, b, ...rest} = {a: 10, b: 20, c: 30, d: 40};\r\n\/\/ a = 10\r\n\/\/ b = 20\r\n\/\/ rest = {c: 30, d: 40}<\/pre>\n
\u89e3\u6784\u9ed8\u8ba4\u503c<\/strong><\/span><\/div>\n
let {a = 10, b = 5} = {a: 3};\r\n\/\/ a = 3; b = 5;\r\nlet {a: aa = 10, b: bb = 5} = {a: 3};\r\n\/\/ aa = 3; bb = 5;<\/pre>\n","protected":false},"excerpt":{"rendered":"
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