{"id":1930,"date":"2023-03-25T14:26:38","date_gmt":"2023-03-25T06:26:38","guid":{"rendered":""},"modified":"2023-03-25T14:26:38","modified_gmt":"2023-03-25T06:26:38","slug":"ES6 \u6570\u5b57","status":"publish","type":"post","link":"https:\/\/bianchenghao6.com\/1930.html","title":{"rendered":"ES6 \u6570\u5b57"},"content":{"rendered":"


\n <\/head>
\n <\/p>\n

\n

ES6 \u6570\u5b57<\/h1>\n<\/p><\/div>\n

ES6 \u6570\u5b57<\/h2>\n
\n ES6 Number \u6709\u51e0\u4e2a\u65b9\u6cd5\u548c\u5c5e\u6027\u6765\u6267\u884c\u5177\u6709\u65e5\u671f\u3001\u6d6e\u70b9\u6570\u3001\u6574\u6570\u7b49\u7684\u6570\u5b57\u51fd\u6570\u3002\u5728 ES6\uff0c\u6211\u4eec\u53ef\u4ee5\u8f7b\u677e\u5730\u4f7f\u7528 Number \u5bf9\u8c61\u3002\u8fd9\u662f\u56e0\u4e3a\u6d4f\u89c8\u5668\u4f1a\u81ea\u52a8\u5c06\u6570\u5b57\u6587\u5b57\u8f6c\u6362\u4e3a\u6570\u5b57\u7c7b\u7684\u5b9e\u4f8b\u3002\n <\/div>\n
\n Number \u5bf9\u8c61\u662f\u901a\u8fc7\u4f7f\u7528 Number() \u6784\u9020\u51fd\u6570\u521b\u5efa\u7684\u3002 Number \u5bf9\u8c61\u7684\u4e00\u4e9b\u4e3b\u8981\u7528\u9014\u5305\u62ec NaN\uff0c\u5b83\u4f1a\u5728\u53c2\u6570\u65e0\u6cd5\u8f6c\u6362\u4e3a\u6570\u5b57\u65f6\u8fd4\u56de\u3002\n <\/div>\n

\u8bed\u6cd5<\/h3>\n
\n
var <\/span>num = new <\/span>Number(value);<\/pre>\n
<\/code>\n  <\/div>\n
\u53c2\u6570<\/h3>\n
\n    \u503c: \u6b63\u5728\u521b\u5efa\u7684\u5bf9\u8c61\u7684\u6570\u503c\u3002\u5982\u679c\u6211\u4eec\u7ed9\u51fa\u4efb\u4f55\u975e\u6570\u5b57\u53c2\u6570\u4ee3\u66ff\u5b83\uff0c\u5219\u5b83\u8fd4\u56de NaN\uff0c\u56e0\u4e3a\u76f8\u5e94\u7684\u53c2\u6570\u4e0d\u80fd\u8f6c\u6362\u4e3a\u6570\u5b57\u3002\n  <\/div>\n
\u6570\u5b57\u5c5e\u6027<\/h2>\n
\n    \u8ba9\u6211\u4eec\u770b\u770b ES6 \u4e2d\u5f15\u5165\u7684 Number \u5bf9\u8c61\u7684\u4e00\u4e9b\u5c5e\u6027\u5217\u8868\u5982\u4e0b:\n  <\/div>\n\n\n\n\n\n\n\n\n\n\n\n\n
\u5c5e\u6027<\/td>\n\u8bf4\u660e<\/td>\n<\/tr>\n
Number.EPSILON<\/td>\n\u5b83\u5b9a\u4e49\u4e86\u4e24\u4e2a\u53ef\u8868\u793a\u6570\u5b57\u4e4b\u95f4\u7684\u6700\u5c0f\u95f4\u9694\u3002<\/td>\n<\/tr>\n
Number.MAX_SAFE_INTEGER<\/td>\n\u5b83\u5b9a\u4e49\u4e86 JavaScript \u4e2d\u7684\u6700\u5927\u5b89\u5168\u6574\u6570(253<\/sup>-1)<\/td>\n<\/tr>\n
Number.MAX_VALUE<\/td>\n\u5b83\u5b9a\u4e49\u4e86\u6700\u5927\u53ef\u80fd\u7684\u53ef\u8868\u793a\u6570\u3002<\/td>\n<\/tr>\n
Number.MIN_SAFE_INTEGER<\/td>\n\u5b83\u5b9a\u4e49\u4e86 JavaScript \u4e2d\u7684\u6700\u5c0f\u5b89\u5168\u6574\u6570(-(253<\/sup>-1))\u3002<\/td>\n<\/tr>\n
Number.MIN_VALUE<\/td>\n\u5b83\u5b9a\u4e49\u4e86\u6700\u63a5\u8fd1\u96f6\u7684\u6700\u5c0f\u6b63\u6570\u3002<\/td>\n<\/tr>\n
Number.Nan<\/td>\n\u5b83\u5b9a\u4e49\u4e86'\u975e\u6570\u5b57'\u503c\u3002<\/td>\n<\/tr>\n
Number.NEGATIVE_INFINITY<\/td>\n\u5b83\u5b9a\u4e49\u4e86\u4e00\u4e2a\u503c\uff0c\u8be5\u503c\u5c0f\u4e8e\u5b9a\u4e49\u7684\u6570\u5b57\u3002<\/td>\n<\/tr>\n
Number.POSITIVE_INFINITY<\/td>\n\u5b83\u5b9a\u4e49\u4e86\u4e00\u4e2a\u503c\uff0c\u8be5\u503c\u5927\u4e8e\u5b9a\u4e49\u7684\u6570\u5b57\u3002<\/td>\n<\/tr>\n
Number.prototype<\/td>\n\u5b83\u5b9a\u4e49\u4e86\u4e00\u4e2a\u4ee3\u8868\u65e0\u7a77\u5927\u7684\u7279\u6b8a\u503c\u3002<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
\n    \u8ba9\u6211\u4eec\u5c1d\u8bd5\u8be6\u7ec6\u8bf4\u660e ES6 \u4e2d\u5f15\u5165\u7684 Number \u5c5e\u6027\u3002\n  <\/div>\n
EPSILON<\/h3>\n
\n    \u8be5\u5c5e\u6027\u8868\u793a1\u4e0e\u6700\u5c0f\u6d6e\u70b9\u6570\u7684\u5dee\uff0c\u5373\u5927\u4e8e1\u3001\u6211\u4eec\u4e0d\u5fc5\u521b\u5efaNumber\u5bf9\u8c61\u6765\u8bbf\u95ee\u9759\u6001\u5c5e\u6027\uff0c\u56e0\u4e3a\u6211\u4eec\u53ef\u4ee5\u7b80\u5355\u5730\u4f7f\u7528Number.EPSILON \u5c5e\u6027\u3002\n  <\/div>\n
\n    \u793a\u4f8b\n  <\/div>\n
\n
var <\/span>value = Number.EPSILON;\nconsole.log<\/span>(value);<\/pre>\n
<\/code>\n  <\/div>\n
\n    \u8f93\u51fa\n  <\/div>\n
\n
2.220446049250313e-16<\/pre>\n
<\/code>\n  <\/div>\n
Number.MAX_SAFE_INTEGER<\/h3>\n
\n    \u8be5\u5c5e\u6027\u4ee3\u8868JavaScript(2
\n   53<\/sup>-1).\n  <\/div>\n
\n    \u793a\u4f8b\n  <\/div>\n
\n
var <\/span>value = Number.MAX_SAFE_INTEGER; \nconsole.log<\/span>(value);<\/pre>\n
<\/code>\n  <\/div>\n
\n    \u8f93\u51fa\n  <\/div>\n
\n
9007199254740991<\/pre>\n
<\/code>\n  <\/div>\n
Number.MAX_VALUE<\/h3>\n
\n    \u8be5\u5c5e\u6027\u5c5e\u4e8e\u9759\u6001 Number \u5bf9\u8c61\uff0c\u8868\u793a\u6700\u5927\u53ef\u80fd\u6b63\u6570\u7684\u5e38\u91cf\u3002\n  <\/div>\n
\n   <\u5f3a>
\n     \u793a\u4f8b
\n   <\/\u5f3a>\n  <\/div>\n
\n
var <\/span>val = Number.MAX_VALUE; \nconsole.log<\/span>(\"Number.MAX_VALUE equals to: \"<\/span> + val );<\/pre>\n
<\/code>\n  <\/div>\n
\n    \u8f93\u51fa\n  <\/div>\n
\n
Number.MAX_VALUE equals to: 1.7976931348623157e+308<\/pre>\n
<\/code>\n  <\/div>\n
Number.MIN_SAFE_INTEGER<\/h3>\n
\n    \u5b83\u8868\u793a JavaScript \u4e2d\u7684\u6700\u5c0f\u5b89\u5168\u6574\u6570(-(2
\n   53<\/sup>-1)).\n  <\/div>\n
\n    \u4f8b\u5b50\n  <\/div>\n
\n
var <\/span>val = Number.MIN_SAFE_INTEGER; \nconsole.log<\/span>(\"Number. MIN_SAFE_INTEGER equals to: \"<\/span> + val );  <\/pre>\n
<\/code>\n  <\/div>\n
\n    \u8f93\u51fa\n  <\/div>\n
\n
Number. MIN_SAFE_INTEGER equals to:-9007199254740991<\/pre>\n
<\/code>\n  <\/div>\n
Number.MIN_VALUE<\/h3>\n
\n    \u8868\u793a\u6700\u5c0f\u7684\u6b63\u6570\u503c\u3002\n  <\/div>\n
\n    \u793a\u4f8b\n  <\/div>\n
\n
var <\/span>val = Number.MIN_VALUE; \nconsole.log<\/span>(\"Number.MIN_VALUE equals to : \"<\/span> + val );<\/pre>\n
<\/code>\n  <\/div>\n
\n    \u8f93\u51fa\n  <\/div>\n
\n
Number.MIN_VALUE equals to : 5e-324<\/pre>\n
<\/code>\n  <\/div>\n
Number \u65b9\u6cd5<\/h2>\n
\n    Number \u5bf9\u8c61\u4ec5\u5305\u542b\u4f5c\u4e3a\u6bcf\u4e2a\u5bf9\u8c61\u5b9a\u4e49\u4e00\u90e8\u5206\u7684\u9ed8\u8ba4\u65b9\u6cd5\u3002 number\u5bf9\u8c61\u7684\u65b9\u6cd5\u5217\u8868\u5982\u4e0b:\n  <\/div>\n\n\n\n\n\n\n\n\n\n
\u65b9\u6cd5<\/td>\n\u8bf4\u660e<\/td>\n<\/tr>\n
Number.isNan()<\/td>\n\u8fd4\u56de\u4f20\u5165\u7684\u503c\u662f\u5426\u4e3aNaN\u3002<\/td>\n<\/tr>\n
Number.isFinite()<\/td>\n\u8fd4\u56de\u4f20\u5165\u7684\u503c\u662f\u5426\u4e3a\u6709\u9650\u6570\u3002<\/td>\n<\/tr>\n
Number.isInteger()<\/td>\n\u8fd4\u56de\u4f20\u5165\u7684\u503c\u662f\u5426\u4e3a\u6574\u6570\u3002<\/td>\n<\/tr>\n
Number.isSafeInteger()<\/td>\n\u5224\u65ad\u4f20\u5165\u7684\u503c\u662f\u5426\u4e3a\u5b89\u5168\u6574\u6570(\u8303\u56f4\u5728-(253<\/sup>-1)\u548c(253<\/sup>-1)).<\/td>\n<\/tr>\n
Number.parseFloat()<\/td>\n\u76f8\u5f53\u4e8e\u5168\u5c40\u5bf9\u8c61\u7684parseFloat()<\/td>\n<\/tr>\n
Numbr.pareInt()<\/td>\n\u76f8\u5f53\u4e8e\u5168\u5c40\u5bf9\u8c61\u7684parseInt()<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
\n    \u8ba9\u6211\u4eec\u8bd5\u7740\u8be6\u7ec6\u8bf4\u660e\u4e00\u4e0b ES6 \u4e2d\u5f15\u5165\u7684\u4e0a\u8ff0 Number \u65b9\u6cd5\u3002\n  <\/div>\n
Number.isNan() <\/h3>\n
\n    \u5224\u65ad\u503c\u662f\u5426\u4e3aNan\u3002\u5982\u679c\u503c\u4e0d\u662f\u6570\u5b57\uff0c\u5219\u8fd4\u56de true\u3002\n  <\/div>\n
\n    \u793a\u4f8b\n  <\/div>\n
\n
var <\/span>res = Number.isNaN<\/span>(NaN); \nconsole.log<\/span>(res); \nvar <\/span>res1 = Number.isNaN<\/span>('Nan'<\/span>); \nconsole.log<\/span>(res1); \nvar <\/span>res2 = Number.isNaN<\/span>(123); \nconsole.log<\/span>(res2);<\/pre>\n
<\/code>\n  <\/div>\n
\n    \u8f93\u51fa\n  <\/div>\n
\n
   true<\/span><\/span>\nfalse\nfalse<\/pre>\n
<\/code>\n  <\/div>\n
Number.isFinite()<\/h3>\n
\n    \u5224\u65ad\u4e00\u4e2a\u503c\u662f\u5426\u4e3a\u6709\u9650\u6570\u3002\u5982\u679c\u503c\u4e3a Number \u7c7b\u578b\u5e76\u7b49\u4e8e\u6709\u9650\u6570\uff0c\u5219\u8fd4\u56de true\u3002\u5426\u5219\u8fd4\u56de false\u3002\n  <\/div>\n
\n    \u793a\u4f8b\n  <\/div>\n
\n
var <\/span>res = Number.isFinite<\/span>(Infinity); \nconsole.log<\/span>(res); \nvar <\/span>res1 = Number.isFinite<\/span>(123); \nconsole.log<\/span>(res1); \nvar <\/span>res2 = Number.isFinite<\/span>('Infinity'<\/span>); \nconsole.log<\/span>(res2);<\/pre>\n
<\/code>\n  <\/div>\n
\n    \u8f93\u51fa\n  <\/div>\n
\n
   false<\/span>\ntrue\nfalse<\/pre>\n
<\/code>\n  <\/div>\n
Number.isInteger()<\/h3>\n
\n    \u987e\u540d\u601d\u4e49\uff0c\u5b83\u51b3\u5b9a\u4e86\u4f20\u9012\u7684\u503c\u662f\u5426\u4e3a\u6574\u6570\u3002\u5982\u679c\u503c\u662f\u6570\u5b57\u5e76\u4e14\u5fc5\u987b\u662f\u6574\u6570(\u4e0d\u5e26\u5c0f\u6570\u7684\u6570\u5b57)\uff0c\u5219\u8fd4\u56de true\u3002\u5426\u5219\u8fd4\u56de false\u3002\n  <\/div>\n
\n    \u793a\u4f8b\n  <\/div>\n
\n
var <\/span>res = Number.isInteger<\/span>(-100); \nconsole.log<\/span>(res); \nvar <\/span>res1 = Number.isInteger<\/span>(100); \nconsole.log<\/span>(res1); \nvar <\/span>res2 = Number.isInteger<\/span>(1.001); \nconsole.log<\/span>(res2);<\/pre>\n
<\/code>\n  <\/div>\n
\n    \u8f93\u51fa\n  <\/div>\n
\n
   true<\/span><\/span>\ntrue\nfalse<\/pre>\n
<\/code>\n  <\/div>\n
Number.isSafeInteger()<\/h3>\n
\n    \u5b89\u5168\u6574\u6570\u662f\u5728-(2
\n   53<\/sup>-1) \u548c(2
\n   53<\/sup>-1)\u3002 Number.isSafeInteger() \u65b9\u6cd5\u786e\u5b9a\u8be5\u503c\u662f\u5426\u4e3a\u5b89\u5168\u6574\u6570\u3002\n  <\/div>\n
\n    \u793a\u4f8b\n  <\/div>\n
\n
var <\/span>res = Number.isSafeInteger<\/span>(-100); \nconsole.log<\/span>(res); \nvar <\/span>res1 = Number.isSafeInteger<\/span>(100.9); \nconsole.log<\/span>(res1); \nvar <\/span>res2 = Number.isSafeInteger<\/span>(-100); \nconsole.log<\/span>(res2); \nvar <\/span>res3 = Number.isSafeInteger<\/span>(Math.pow<\/span>(2,53)); \nconsole.log<\/span>(res3);<\/pre>\n
<\/code>\n  <\/div>\n
\n    \u8f93\u51fa\n  <\/div>\n
\n
   true<\/span><\/span>\nfalse\ntrue\ntrue<\/pre>\n
<\/code>\n  <\/div>\n
\u4e8c\u8fdb\u5236\u3001\u516b\u8fdb\u5236\u548c\u5341\u516d\u8fdb\u5236\u6587\u5b57<\/h2>\n
\n    ES6 \u6dfb\u52a0\u4e86\u5bf9\u4e8c\u8fdb\u5236\u6587\u5b57\u7684\u652f\u6301\u5e76\u6539\u53d8\u4e86\u6587\u5b57\u7684\u8868\u793a\u65b9\u5f0f\u3002\u8ba9\u6211\u4eec\u770b\u770b ES6 \u4e2d\u6587\u5b57\u7684\u8868\u793a\u3002\n  <\/div>\n
\u4e8c\u8fdb\u5236\u6587\u5b57\u8868\u793a<\/h3>\n
\n    ES6 \u4e2d\u7684\u4e8c\u8fdb\u5236\u6587\u5b57\u4f7f\u7528 0b \u524d\u7f00\u8868\u793a, \u540e\u8ddf\u4e8c\u8fdb\u5236\u6570\u5e8f\u5217\uff0c\u5206\u522b\u662f0 \u548c1\u3002\n  <\/div>\n
\n    \u524d\u7f00\u53ef\u4ee5\u5c0f\u5199\u4e5f\u53ef\u4ee5\u5927\u5199\u3002\u4f46\u662f\uff0c\u5efa\u8bae\u524d\u7f00\u4f7f\u7528\u5c0f\u5199\u3002\n  <\/div>\n
\n    \u793a\u4f8b\n  <\/div>\n
\n
console.log<\/span>(0b010) \nconsole.log<\/span>(0b110) \nconsole.log<\/span>(0b101) \nconsole.log<\/span>(0B100)<\/pre>\n
<\/code>\n  <\/div>\n
\n    \u8f93\u51fa\n  <\/div>\n
\n
2\n6\n5\n4<\/pre>\n
<\/code>\n  <\/div>\n
\u516b\u8fdb\u5236\u6587\u5b57\u8868\u793a<\/h3>\n
\n    ES6 \u4e2d\u7684\u516b\u8fdb\u5236\u6587\u5b57\u4f7f\u7528 0o \u524d\u7f00\u8868\u793a\uff0c\u540e\u8ddf\u516b\u8fdb\u5236\u6570\u5b57\u5e8f\u5217(\u4ece 0 \u5230 7 )\u3002\u6211\u4eec\u4e0d\u80fd\u5728\u516b\u8fdb\u5236\u6587\u5b57\u4e2d\u5305\u542b\u8d85\u51fa\u8303\u56f4(0 \u5230 7)\u7684\u6570\u5b57\u6216\u6570\u5b57\u7ec4\u5408\u3002\n  <\/div>\n
\n    \u793a\u4f8b\n  <\/div>\n
\n
console.log<\/span>(0o34) \nconsole.log<\/span>(0o1007)\nconsole.log<\/span>(0o571234)<\/pre>\n
<\/code>\n  <\/div>\n
\n    \u8f93\u51fa\n  <\/div>\n
\n
28\n519\n193180<\/pre>\n
<\/code>\n  <\/div>\n
\u5341\u516d\u8fdb\u5236\u6587\u5b57\u8868\u793a<\/h3>\n
\n    ES6 \u4e2d\u7684\u5341\u516d\u8fdb\u5236\u6587\u5b57\u4f7f\u7528 0x \u524d\u7f00\u8868\u793a\n  <\/div>\n
\n    \u793a\u4f8b\n  <\/div>\n
\n
console.log<\/span>(0x678) \nconsole.log<\/span>(0x100)\nconsole.log<\/span>(0x788)<\/pre>\n
<\/code>\n  <\/div>\n
\n    \u8f93\u51fa\n  <\/div>\n
\n
1656\n256\n1928<\/pre>\n
<\/code>\n  <\/div>\n
 <\/body>
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