{"id":161983,"date":"2020-09-27T21:04:51","date_gmt":"2020-09-27T13:04:51","guid":{"rendered":"http:\/\/4563.org\/?p=161983"},"modified":"2020-09-27T21:04:51","modified_gmt":"2020-09-27T13:04:51","slug":"%e5%89%8d%e7%ab%af%e5%b0%8f%e7%99%bd%e7%aa%81%e7%84%b6%e6%83%b3%e5%88%b0%e4%b8%aa%e9%97%ae%e9%a2%98%ef%bc%8c%e6%83%b3%e8%af%b7%e6%95%99%e4%b8%80%e4%b8%8b%e5%90%84%e4%bd%8d-dalao%ef%bc%8c-javascript","status":"publish","type":"post","link":"http:\/\/4563.org\/?p=161983","title":{"rendered":"\u524d\u7aef\u5c0f\u767d\u7a81\u7136\u60f3\u5230\u4e2a\u95ee\u9898\uff0c\u60f3\u8bf7\u6559\u4e00\u4e0b\u5404\u4f4d dalao\uff0c JavaScript \u4e2d\u7684 Math.random()\u662f\u5982\u4f55\u5b9e\u73b0\u968f\u673a\u6570\u7684\uff1f\u7528\u4e86\u8fd9\u4e48\u4e45\uff0c\u597d\u50cf\u53ea\u77e5\u5176\u7136\uff0c\u800c\u4e0d\u77e5\u5176\u6240\u4ee5\u7136"},"content":{"rendered":"
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\u524d\u7aef\u5c0f\u767d\u7a81\u7136\u60f3\u5230\u4e2a\u95ee\u9898\uff0c\u60f3\u8bf7\u6559\u4e00\u4e0b\u5404\u4f4d dalao\uff0c JavaScript \u4e2d\u7684 Math.random()\u662f\u5982\u4f55\u5b9e\u73b0\u968f\u673a\u6570\u7684\uff1f\u7528\u4e86\u8fd9\u4e48\u4e45\uff0c\u597d\u50cf\u53ea\u77e5\u5176\u7136\uff0c\u800c\u4e0d\u77e5\u5176\u6240\u4ee5\u7136 <\/h1>\n

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\u8cc7\u6df1\u5927\u4f6c : damao2250 <\/span> <\/i> 4<\/span> <\/div>\n
<\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n
\u6bcf\u4e2a\u6d4f\u89c8\u5668\u7684\u5b9e\u73b0\u4e0d\u4e00\u6837\uff0c\u6bd4\u5982 Chrome V8 \u7684\u5b9e\u73b0\uff1a
\/\/ ECMA 262 – 15.8.2.14
var rngstate; \/\/ Initialized to a Uint32Array during genesis.
function MathRandom() {
var r0 = (MathImul(18030, rngstate[0] & 0xFFFF) + (rngstate[0] >>> 16)) | 0;
rngstate[0] = r0;
var r1 = (MathImul(36969, rngstate[1] & 0xFFFF) + (rngstate[1] >>> 16)) | 0;
rngstate[1] = r1;
var x = ((r0 << 16) + (r1 & 0xFFFF)) | 0;
\/\/ Division by 0x100000000 through multiplication by reciprocal.
return (x < 0 ? (x + 0x100000000) : x) * 2.3283064365386962890625e-10;
}<\/p>\n

https:\/\/github.com\/v8\/v8\/blob\/dae6dfe08ba9810abbe7eee81f7c58e999ae8525\/src\/math.js#L144 <\/div>\n

\u5927\u4f6c\u6709\u8a71\u8aaa<\/b> (3<\/span>) <\/div>\n
<\/div>\n<\/p><\/div>\n<\/p><\/div>\n
    \n
  • \n
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    \u8cc7\u6df1\u5927\u4f6c : Xusually <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u4e0d\u5b89\u5168\u7684\uff0c\u57fa\u672c\u90fd\u5c5e\u4e8e\u4f2a\u968f\u673a\u6570 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
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    \u8cc7\u6df1\u5927\u4f6c : godblessumilk <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u771f\u968f\u673a\u6570\u7684\u6280\u672f\u5df2\u7ecf\u5f88\u6210\u719f\u4e86\uff0c\u73b0\u4ee3\u7cfb\u7edf\u5927\u591a\u90fd\u63d0\u4f9b\u4e86\u771f\u968f\u673a\u6570\u751f\u6210\u5668\uff0c\u7279\u522b\u662f\u64cd\u4f5c\u7cfb\u7edf\u3002<\/p>\n

    \u4e3e\u4e2a\u4f8b\u5b50\uff0cLinux \u64cd\u4f5c\u7cfb\u7edf\u4e0a\u6709 \/dev\/random \u548c \/dev\/urandom \u4e24\u4e2a\u968f\u673a\u6570\u751f\u6210\u5668\uff0c\u611f\u5174\u8da3\u53ef\u4ee5\u53bb\u67e5\u4e00\u4e0b\u76f8\u5173\u6587\u732e\uff0c\u7b80\u5355\u6765\u8bb2\u5c31\u662f\u4f1a\u68c0\u6d4b\u8ba1\u7b97\u673a\u8fd0\u884c\u8fc7\u7a0b\u4e2d\u7684\u4e00\u4e9b\u201c\u566a\u58f0\u201d\uff0c\u6bd4\u5982\u65f6\u95f4\u3001IO \u54cd\u5e94\u65f6\u95f4\u3001\u5916\u8bbe\u4fe1\u53f7\u53d8\u5316\u3001\u952e\u76d8\u6572\u51fb\u65f6\u673a\u3001\u9f20\u6807\u4f4d\u7f6e\u53d8\u5316\uff0c\u751a\u81f3\u662f\u78c1\u573a\u6ce2\u52a8\uff0c\u4e0d\u540c\u7cfb\u7edf\uff08\u53d1\u884c\u7248\uff09\u3001\u786c\u4ef6\u73af\u5883\u80fd\u63d0\u4f9b\u7684\u201c\u566a\u58f0\u201d\u6765\u6e90\u4e0d\u540c\u3002<\/p>\n

    JS \u7684 Math.random()\u6ca1\u6709\u89c4\u5b9a\u5e95\u5c42\u5b9e\u73b0\u7ec6\u8282\uff0c\u7531\u5404\u4e2a JS \u5f15\u64ce\u81ea\u5df1\u51b3\u5b9a\u5982\u4f55\u5b9e\u73b0\uff0c\u6700\u7701\u4e8b\u7684\u65b9\u5f0f\u5c31\u662f\u76f4\u63a5\u8c03\u7528\u7cfb\u7edf\u7684\u968f\u673a\u6570\u751f\u6210\u5668\u3002 <\/p><\/div>\n<\/p><\/div>\n<\/li>\n

  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : libook <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    @Xusually
    @godblessumilk
    @libook
    \u611f\u8c22\u5404\u4f4d\u5927\u4f6c\u7684\u89e3\u7b54\uff0c\u5c0f\u5f1f\u53d7\u6559\u4e86 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n","protected":false},"excerpt":{"rendered":"

    \u524d\u7aef\u5c0f\u767d\u7a81\u7136\u60f3\u5230\u4e2a\u95ee\u9898\uff0c\u60f3\u8bf7\u6559\u4e00\u4e0b…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[],"tags":[],"_links":{"self":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts\/161983"}],"collection":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=161983"}],"version-history":[{"count":0,"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts\/161983\/revisions"}],"wp:attachment":[{"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=161983"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=161983"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=161983"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}