{"id":1552,"date":"2024-08-06T17:07:01","date_gmt":"2024-08-06T09:07:01","guid":{"rendered":"https:\/\/log.tanxiaodian.com\/?p=1552"},"modified":"2024-08-06T17:07:01","modified_gmt":"2024-08-06T09:07:01","slug":"js%e7%9a%84%e6%b5%ae%e7%82%b9%e6%95%b0%e8%ae%a1%e7%ae%97%e7%b2%be%e5%ba%a6%e9%97%ae%e9%a2%98","status":"publish","type":"post","link":"https:\/\/log.tanxiaodian.com\/?p=1552","title":{"rendered":"JS\u7684\u6d6e\u70b9\u6570\u8ba1\u7b97\u7cbe\u5ea6\u95ee\u9898"},"content":{"rendered":"\n

0.1 * 3 \u5e94\u8be5\u7b49\u4e8e0.3\u8fd9\u662f\u6b63\u5e38\u7406\u89e3\u5bf9\u5427<\/p>\n\n\n\n

\u53ef\u662fjs\u544a\u8bc9\u6211\u4e0d\u662f0.3 \u6211\u6d4b\u8bd5\u8f93\u51fa0.30000000002 \u60ca\u5446\u4e86<\/p>\n\n\n\n

\u600e\u4e48\u529e \u8fd8\u597d\u524d\u4eba\u5df2\u7ecf\u5e2e\u6211\u4eec\u89e3\u51b3 \u53ef\u4ee5\u4f7f\u7528 decimal.js \u8fd9\u4e2a\u5e93<\/p>\n\n\n\n

https://www.jianshu.com\/p\/2ed7129a7ed0<\/code><\/pre>\n\n\n\n
\u8fd9\u662f\u522b\u4eba\u7684\u89e3\u51b3\u65b9\u6848  \u6211copy\u4e00\u4e0b \u7559\u4f5c\u53c2\u8003<\/p>\n\n\n\n
API<\/h5>\n\n\n\n
1.\u83b7\u53d6\u7edd\u5bf9\u503c<\/em><\/p>\n\n\n\n
a = Decimal.abs(x)\nb = new Decimal(x).abs()\na.equals(b)                    \/\/ true\n\nx = new Decimal(-0.8)\ny = x.absoluteValue()         \/\/ '0.8'\nz = x.abs()                   \/\/ '0.8'\n<\/code><\/pre>\n\n\n\n
2.\u83b7\u53d6\u6574\u6570<\/em><\/p>\n\n\n\n
a = Decimal.trunc(x)\nb = new Decimal(x).trunc()\na.equals(b)                    \/\/ true\n\nx = new Decimal(123.456)\nx.truncated()                            \/\/ '123'\ny = new Decimal(-12.3)\ny.trunc()                                \/\/ '-12'\n<\/code><\/pre>\n\n\n\n
3.\u83b7\u53d6\u6b63\u65e0\u7a77\u5927\u65b9\u5411\u7684\u6574\u6570<\/em><\/p>\n\n\n\n
a = Decimal.ceil(x)\nb = new Decimal(x).ceil()\na.equals(b)                    \/\/ true\n\nx = new Decimal(1.3)\nx.ceil()                      \/\/ '2'\ny = new Decimal(-1.8)\ny.ceil()                      \/\/ '-1'\n<\/code><\/pre>\n\n\n\n
4.\u83b7\u53d6\u8d1f\u65e0\u7a77\u5927\u65b9\u5411\u7684\u6574\u6570<\/em><\/p>\n\n\n\n
a = Decimal.floor(x)\nb = new Decimal(x).floor()\na.equals(b)                    \/\/ true\n\nx = new Decimal(1.8)\nx.floor()                   \/\/ '1'\ny = new Decimal(-1.3)\ny.floor()                   \/\/ '-2'\n<\/code><\/pre>\n\n\n\n
5.\u83b7\u53d6\u6700\u5927\u503c<\/em><\/p>\n\n\n\n
r = Decimal.max(x, y, z)\n<\/code><\/pre>\n\n\n\n
6.\u83b7\u53d6\u6700\u5c0f\u503c<\/em><\/p>\n\n\n\n
r = Decimal.min(x, y, z)\n<\/code><\/pre>\n\n\n\n
7.\u83b7\u53d6\u5927\u4e8e\u7b49\u4e8e0\u5c0f\u4e8e1\u7684\u968f\u673a\u6570<\/em><\/p>\n\n\n\n
Decimal.set({ precision: 10 })\nDecimal.random()                    \/\/ '0.4117936847'\nDecimal.random(20)                  \/\/ '0.78193327636914089009'\n<\/code><\/pre>\n\n\n\n
8.\u83b7\u53d6\u5c0f\u6570\u4f4d\u6570<\/em><\/p>\n\n\n\n
x = new Decimal(1.234)\nx.decimalPlaces()              \/\/ '3'\ny = new Decimal(987.654321)\ny.dp()                         \/\/ '6'\n<\/code><\/pre>\n\n\n\n
9.\u83b7\u53d6\u53cd\u503c<\/em><\/p>\n\n\n\n
x = new Decimal(1.8)\nx.negated()                              \/\/ '-1.8'\ny = new Decimal(-1.3)\ny.neg()                                  \/\/ '1.3'\n<\/code><\/pre>\n\n\n\n
10.\u83b7\u53d6\u4f4d\u6570<\/em><\/p>\n\n\n\n
x = new Decimal(1.234)\nx.precision()                            \/\/ '4'\ny = new Decimal(987000)\ny.sd()                                   \/\/ '3'\ny.sd(true)                               \/\/ '6'\n<\/code><\/pre>\n\n\n\n
11.\u83b7\u53d6\u6307\u5b9a\u5c0f\u6570\u4f4d\u6570\u7684\u5b57\u7b26\u4e32<\/em><\/p>\n\n\n\n
x = 3.456\ny = new Decimal(x)\nx.toFixed()                       \/\/ '3'\ny.toFixed()                       \/\/ '3.456'\ny.toFixed(0)                      \/\/ '3'\nx.toFixed(2)                      \/\/ '3.46'\ny.toFixed(2)                      \/\/ '3.46'\ny.toFixed(2, Decimal.ROUND_DOWN)  \/\/ '3.45'\nx.toFixed(5)                      \/\/ '3.45600'\ny.toFixed(5)                      \/\/ '3.45600'\n<\/code><\/pre>\n\n\n\n
12.\u4fdd\u7559\u5c0f\u6570\u6307\u5b9a\u4f4d\u6570<\/em><\/p>\n\n\n\n
x = new Decimal(12.34567)\nx.toDecimalPlaces(0)                      \/\/ '12'\nx.toDecimalPlaces(1, Decimal.ROUND_UP)    \/\/ '12.3'\n\ny = new Decimal(9876.54321)\ny.toDP(3)                           \/\/ '9876.543'\ny.toDP(1, 0)                        \/\/ '9876.6'\ny.toDP(1, Decimal.ROUND_DOWN)       \/\/ '9876.5'\n<\/code><\/pre>\n\n\n\n
  1. \u52a0\u6cd5<\/li><\/ol>\n\n\n\n
    <\/em><\/p>\n\n\n\n
    a = Decimal.add(x, y)\nb = new Decimal(x).plus(y)\na.equals(b)                    \/\/ true\n\n0.1 + 0.2                                \/\/ 0.30000000000000004\nx = new Decimal(0.1)\ny = x.plus(0.2)                          \/\/ '0.3'\nnew Decimal(0.7).plus(x).plus(y)         \/\/ '1.1'\n<\/code><\/pre>\n\n\n\n
    14.\u51cf\u6cd5<\/em><\/p>\n\n\n\n
    a = Decimal.sub(x, y)\nb = new Decimal(x).sub(y)\na.equals(b)                    \/\/ true\n\n0.3 - 0.1                                \/\/ 0.19999999999999998\nx = new Decimal(0.3)\nx.minus(0.1)                             \/\/ '0.2'\n<\/code><\/pre>\n\n\n\n
    15.\u4e58\u6cd5<\/em><\/p>\n\n\n\n
    a = Decimal.mul(x, y)\nb = new Decimal(x).mul(y)\na.equals(b)                    \/\/ true\n\n0.6 * 3                                  \/\/ 1.7999999999999998\nx = new Decimal(0.6)\ny = x.times(3)                           \/\/ '1.8'\nnew Decimal('7e+500').times(y)           \/\/ '1.26e+501'\n<\/code><\/pre>\n\n\n\n
    16.\u9664\u6cd5<\/em><\/p>\n\n\n\n
    a = Decimal.div(x, y)\nb = new Decimal(x).div(y)\na.equals(b)                    \/\/ true\n\nx = new Decimal(355)\ny = new Decimal(113)\nx.dividedBy(y)             \/\/ '3.14159292035398230088'\nx.div(5)                   \/\/ '71'\n<\/code><\/pre>\n\n\n\n
    17.%\u6a21\u8fd0\u7b97<\/em><\/p>\n\n\n\n
    a = Decimal.mod(x, y)\nb = new Decimal(x).mod(y)\na.equals(b)                    \/\/ true\n\n1 % 0.9                                  \/\/ 0.09999999999999998\nx = new Decimal(1)\nx.modulo(0.9)                            \/\/ '0.1'\n\ny = new Decimal(8)\nz = new Decimal(-3)\nDecimal.modulo = 1\ny.mod(z)                                 \/\/ '2'\nDecimal.modulo = 3\ny.mod(z)                                 \/\/ '-1'<\/code><\/pre>\n\n\n\n
    \u4f5c\u8005\uff1a\u5f20\u601d\u5b66
    \u94fe\u63a5\uff1ahttps:\/\/www.jianshu.com\/p\/2ed7129a7ed0
    \u6765\u6e90\uff1a\u7b80\u4e66
    \u8457\u4f5c\u6743\u5f52\u4f5c\u8005\u6240\u6709\u3002\u5546\u4e1a\u8f6c\u8f7d\u8bf7\u8054\u7cfb\u4f5c\u8005\u83b7\u5f97\u6388\u6743\uff0c\u975e\u5546\u4e1a\u8f6c\u8f7d\u8bf7\u6ce8\u660e\u51fa\u5904\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
    0.1 * 3 \u5e94\u8be5\u7b49\u4e8e0.3\u8fd9\u662f\u6b63\u5e38\u7406\u89e3\u5bf9\u5427 \u53ef…<\/p>\n
    Continue readingJS\u7684\u6d6e\u70b9\u6570\u8ba1\u7b97\u7cbe\u5ea6\u95ee\u9898<\/span><\/a><\/div>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[66],"tags":[276],"_links":{"self":[{"href":"https:\/\/log.tanxiaodian.com\/index.php?rest_route=\/wp\/v2\/posts\/1552"}],"collection":[{"href":"https:\/\/log.tanxiaodian.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/log.tanxiaodian.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/log.tanxiaodian.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/log.tanxiaodian.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1552"}],"version-history":[{"count":1,"href":"https:\/\/log.tanxiaodian.com\/index.php?rest_route=\/wp\/v2\/posts\/1552\/revisions"}],"predecessor-version":[{"id":1553,"href":"https:\/\/log.tanxiaodian.com\/index.php?rest_route=\/wp\/v2\/posts\/1552\/revisions\/1553"}],"wp:attachment":[{"href":"https:\/\/log.tanxiaodian.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1552"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/log.tanxiaodian.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1552"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/log.tanxiaodian.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1552"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}