{"id":44492,"date":"2025-06-19T09:27:42","date_gmt":"2025-06-19T01:27:42","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/44492.html"},"modified":"2025-06-19T09:27:42","modified_gmt":"2025-06-19T01:27:42","slug":"number-tofixed-%e4%b8%8e-math-round-%e6%b7%b1%e5%ba%a6%e5%af%b9%e6%af%94%e8%a7%a3%e6%9e%90","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/44492.html","title":{"rendered":"Number.toFixed() \u4e0e Math.round() \u6df1\u5ea6\u5bf9\u6bd4\u89e3\u6790"},"content":{"rendered":"

\u5728 JavaScript \u4e2d\u5904\u7406\u6570\u5b57\u820d\u5165\u65f6，Number.toFixed() \u548c Math.round() \u662f\u4e24\u79cd\u5e38\u7528\u4f46\u884c\u4e3a\u5b8c\u5168\u4e0d\u540c\u7684\u65b9\u6cd5\u3002\u5b83\u4eec\u7684\u5173\u952e\u533a\u522b\u5728\u4e8e\u820d\u5165\u89c4\u5219\u548c\u8fd4\u56de\u503c\u7c7b\u578b\u3002<\/p>\n

\u6838\u5fc3\u533a\u522b\u603b\u7ed3<\/h2>\n\n\u7279\u6027Math.round()Number.toFixed()<\/tr>\n\n\n\n\n\n\n\n
\u820d\u5165\u89c4\u5219<\/td>\n\u4f20\u7edf\u56db\u820d\u4e94\u5165<\/td>\n\u94f6\u884c\u5bb6\u820d\u5165 (IEEE 754 \u6807\u51c6)<\/td>\n<\/tr>\n
\u8fd4\u56de\u503c\u7c7b\u578b<\/td>\n\u6570\u5b57<\/td>\n\u5b57\u7b26\u4e32<\/td>\n<\/tr>\n
\u5c0f\u6570\u4f4d\u63a7\u5236<\/td>\n\u53ea\u80fd\u53d6\u6574\u5230\u6574\u6570\u4f4d<\/td>\n\u53ef\u6307\u5b9a\u4fdd\u7559\u5c0f\u6570\u4f4d\u6570 (0-20)<\/td>\n<\/tr>\n
\u8fb9\u754c\u5904\u7406<\/td>\n0.5 \u603b\u662f\u8fdb\u4f4d<\/td>\n0.5 \u65f6\u4f7f\u7528"\u4e94\u6210\u53cc"\u89c4\u5219<\/td>\n<\/tr>\n
\u8d1f\u6570\u5904\u7406<\/td>\n\u5411\u6b63\u65e0\u7a77\u65b9\u5411\u820d\u5165<\/td>\n\u4e0e\u6b63\u6570\u76f8\u540c\u89c4\u5219<\/td>\n<\/tr>\n
\u7cbe\u5ea6\u95ee\u9898<\/td>\n\u53ef\u80fd\u5f15\u5165\u6d6e\u70b9\u6570\u8bef\u5dee<\/td>\n\u7ed3\u679c\u4ee5\u5b57\u7b26\u4e32\u5f62\u5f0f\u907f\u514d\u7cbe\u5ea6\u95ee\u9898<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u8be6\u7ec6\u89e3\u6790<\/h2>\n
  • \u820d\u5165\u89c4\u5219\u5dee\u5f02（\u6838\u5fc3\u533a\u522b） Math.round() – \u4f20\u7edf\u56db\u820d\u4e94\u5165<\/li>\n

    Math.<\/span>round<\/span>(<\/span>1.5<\/span>)<\/span> \/\/ 2（0.5\u8fdb\u4f4d）<\/span>
    \nMath.<\/span>round<\/span>(<\/span>2.5<\/span>)<\/span> \/\/ 3（0.5\u8fdb\u4f4d）<\/span>
    \nMath.<\/span>round<\/span>(<\/span>1.49<\/span>)<\/span> \/\/ 1（\u5c0f\u4e8e0.5\u820d\u53bb）<\/span>
    \nMath.<\/span>round<\/span>(<\/span>–<\/span>1.5<\/span>)<\/span> \/\/ -1（\u5411\u6b63\u65e0\u7a77\u65b9\u5411\u820d\u5165）<\/span><\/p>\n

    Number.toFixed() – \u94f6\u884c\u5bb6\u820d\u5165（IEEE 754 \u6807\u51c6）<\/p>\n

    (<\/span>1.5<\/span>)<\/span>.<\/span>toFixed<\/span>(<\/span>0<\/span>)<\/span> \/\/ "2"（5\u524d1\u662f\u5947\u6570\u2192\u8fdb\u4f4d）<\/span>
    \n(<\/span>2.5<\/span>)<\/span>.<\/span>toFixed<\/span>(<\/span>0<\/span>)<\/span> \/\/ "2"（5\u524d2\u662f\u5076\u6570\u2192\u820d\u53bb）<\/span>
    \n(<\/span>1.35<\/span>)<\/span>.<\/span>toFixed<\/span>(<\/span>1<\/span>)<\/span> \/\/ "1.4"（5\u524d3\u662f\u5947\u6570\u2192\u8fdb\u4f4d）<\/span>
    \n(<\/span>1.25<\/span>)<\/span>.<\/span>toFixed<\/span>(<\/span>1<\/span>)<\/span> \/\/ "1.2"（5\u524d2\u662f\u5076\u6570\u2192\u820d\u53bb）<\/span>
    \n(<\/span>–<\/span>2.5<\/span>)<\/span>.<\/span>toFixed<\/span>(<\/span>0<\/span>)<\/span> \/\/ "-2"（\u89c4\u5219\u540c\u6b63\u6570）<\/span><\/p>\n

  • \u8fd4\u56de\u503c\u7c7b\u578b\u5dee\u5f02 Math.round() \u8fd4\u56de\u6570\u5b57\u7c7b\u578b：<\/li>\n

    const<\/span> result =<\/span> Math.<\/span>round<\/span>(<\/span>1.5<\/span>)<\/span>;<\/span>
    \nconsole.<\/span>log<\/span>(<\/span>typeof<\/span> result)<\/span>;<\/span> \/\/ "number"<\/span>
    \nconsole.<\/span>log<\/span>(<\/span>result +<\/span> 1<\/span>)<\/span>;<\/span> \/\/ 3（\u53ef\u76f4\u63a5\u8fd0\u7b97）<\/span><\/p>\n

    toFixed() \u8fd4\u56de\u5b57\u7b26\u4e32\u7c7b\u578b：<\/p>\n

    const<\/span> result =<\/span> (<\/span>1.5<\/span>)<\/span>.<\/span>toFixed<\/span>(<\/span>0<\/span>)<\/span>;<\/span>
    \nconsole.<\/span>log<\/span>(<\/span>typeof<\/span> result)<\/span>;<\/span> \/\/ "string"<\/span>
    \nconsole.<\/span>log<\/span>(<\/span>result +<\/span> 1<\/span>)<\/span>;<\/span> \/\/ "21"（\u5b57\u7b26\u4e32\u62fc\u63a5）<\/span><\/p>\n

  • \u5c0f\u6570\u4f4d\u63a7\u5236\u80fd\u529b Math.round() \u53ea\u80fd\u53d6\u6574：<\/li>\n

    Math.<\/span>round<\/span>(<\/span>1.234<\/span>)<\/span> \/\/ 1（\u65e0\u6cd5\u63a7\u5236\u5c0f\u6570\u4f4d）<\/span>
    \nMath.<\/span>round<\/span>(<\/span>1.234<\/span> *<\/span> 100<\/span>)<\/span> \/<\/span> 100<\/span> \/\/ 1.23（\u9700\u624b\u52a8\u5904\u7406）<\/span><\/p>\n

    toFixed() \u53ef\u6307\u5b9a\u5c0f\u6570\u4f4d\u6570：<\/p>\n

    (<\/span>1.234<\/span>)<\/span>.<\/span>toFixed<\/span>(<\/span>2<\/span>)<\/span> \/\/ "1.23"<\/span>
    \n(<\/span>1.235<\/span>)<\/span>.<\/span>toFixed<\/span>(<\/span>2<\/span>)<\/span> \/\/ "1.24"（\u94f6\u884c\u5bb6\u820d\u5165）<\/span>
    \n(<\/span>1.999<\/span>)<\/span>.<\/span>toFixed<\/span>(<\/span>2<\/span>)<\/span> \/\/ "2.00"（\u8fdb\u4f4d\u4f20\u64ad）<\/span><\/p>\n

  • \u8fb9\u754c\u60c5\u51b5\u5bf9\u6bd4<\/li>\n\n\u6570\u503cMath.round()(num).toFixed(0)\u5dee\u5f02\u539f\u56e0<\/tr>\n\n\n\n\n\n\n\n
    1.5<\/td>\n2<\/td>\n\u201c2\u201d<\/td>\n\u76f8\u540c\u7ed3\u679c<\/td>\n<\/tr>\n
    2.5<\/td>\n3<\/td>\n\u201c2\u201d<\/td>\n\u94f6\u884c\u5bb6\u820d\u5165\u7684\u5076\u6570\u89c4\u5219<\/td>\n<\/tr>\n
    -1.5<\/td>\n-1<\/td>\n\u201c-2\u201d<\/td>\n\u8d1f\u6570\u820d\u5165\u65b9\u5411\u4e0d\u540c<\/td>\n<\/tr>\n
    1.35 (1\u4f4d\u5c0f\u6570)<\/td>\n–<\/td>\n\u201c1.4\u201d<\/td>\n\u94f6\u884c\u5bb6\u820d\u5165（3\u662f\u5947\u6570\u8fdb\u4f4d）<\/td>\n<\/tr>\n
    1.25 (1\u4f4d\u5c0f\u6570)<\/td>\n–<\/td>\n\u201c1.2\u201d<\/td>\n\u94f6\u884c\u5bb6\u820d\u5165（2\u662f\u5076\u6570\u820d\u53bb）<\/td>\n<\/tr>\n
    0.615 (2\u4f4d)<\/td>\n–<\/td>\n\u201c0.61\u201d<\/td>\n\u6d6e\u70b9\u6570\u7cbe\u5ea6\u5f71\u54cd(\u5b9e\u96450.614999\u2026)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
  • \u8d1f\u6570\u5904\u7406\u5dee\u5f02 Math.round() \u5bf9\u8d1f\u6570\u7684\u7279\u6b8a\u5904\u7406：<\/li>\n

    Math.<\/span>round<\/span>(<\/span>–<\/span>1.5<\/span>)<\/span> \/\/ -1（\u5411\u6b63\u65e0\u7a77\u65b9\u5411\u820d\u5165）<\/span>
    \nMath.<\/span>round<\/span>(<\/span>–<\/span>1.6<\/span>)<\/span> \/\/ -2<\/span>
    \nMath.<\/span>round<\/span>(<\/span>–<\/span>2.5<\/span>)<\/span> \/\/ -2<\/span><\/p>\n

    toFixed() \u5bf9\u8d1f\u6570\u4f7f\u7528\u76f8\u540c\u89c4\u5219：<\/p>\n

    (<\/span>–<\/span>1.5<\/span>)<\/span>.<\/span>toFixed<\/span>(<\/span>0<\/span>)<\/span> \/\/ "-2"（\u89c4\u5219\u540c\u6b63\u6570：1\u5947\u8fdb\u4f4d）<\/span>
    \n(<\/span>–<\/span>2.5<\/span>)<\/span>.<\/span>toFixed<\/span>(<\/span>0<\/span>)<\/span> \/\/ "-2"（\u89c4\u5219\u540c\u6b63\u6570：2\u5076\u820d\u53bb）<\/span><\/p>\n

    \u5b9e\u9645\u5e94\u7528\u573a\u666f<\/h2>\n

    \u4f55\u65f6\u4f7f\u7528 Math.round()<\/h3>\n
  • \u7b80\u5355\u6574\u6570\u820d\u5165：<\/li>\n

    \/\/ \u7528\u6237\u8bc4\u5206\u5c55\u793a<\/span>
    \nconst<\/span> averageRating =<\/span> Math.<\/span>round<\/span>(<\/span>4.25<\/span>)<\/span>;<\/span> \/\/ 4<\/span><\/p>\n

  • \u6027\u80fd\u654f\u611f\u573a\u666f（\u6bd4 toFixed() \u5feb\u7ea610\u500d）<\/li>\n
  • \u7b26\u5408\u4f20\u7edf\u56db\u820d\u4e94\u5165\u9884\u671f\u7684UI\u663e\u793a：<\/li>\n

    \/\/ \u6e29\u5ea6\u663e\u793a<\/span>
    \nconst<\/span> displayTemp =<\/span> Math.<\/span>round<\/span>(<\/span>23.5<\/span>)<\/span>;<\/span> \/\/ 24（\u7b26\u5408\u7528\u6237\u9884\u671f）<\/span><\/p>\n

    \u4f55\u65f6\u4f7f\u7528 Number.toFixed()<\/h3>\n
  • \u91d1\u878d\u8ba1\u7b97：<\/li>\n

    \/\/ \u8d27\u5e01\u91d1\u989d\u663e\u793a<\/span>
    \nconst<\/span> total =<\/span> (<\/span>10.005<\/span>)<\/span>.<\/span>toFixed<\/span>(<\/span>2<\/span>)<\/span>;<\/span> \/\/ "10.00"（\u7b26\u5408\u4f1a\u8ba1\u6807\u51c6）<\/span><\/p>\n

  • \u9700\u8981\u56fa\u5b9a\u5c0f\u6570\u4f4d\u7684\u573a\u666f：<\/li>\n

    \/\/ \u767e\u5206\u6bd4\u663e\u793a<\/span>
    \nconst<\/span> percentage =<\/span> (<\/span>0.2356<\/span>)<\/span>.<\/span>toFixed<\/span>(<\/span>2<\/span>)<\/span>;<\/span> \/\/ "0.24"<\/span><\/p>\n

  • \u907f\u514d\u6d6e\u70b9\u6570\u7cbe\u5ea6\u95ee\u9898\u7684\u663e\u793a：<\/li>\n

    \/\/ \u907f\u514d\u663e\u793a 0.1 + 0.2 = 0.30000000000000004<\/span>
    \n(<\/span>0.1<\/span> +<\/span> 0.2<\/span>)<\/span>.<\/span>toFixed<\/span>(<\/span>2<\/span>)<\/span>;<\/span> \/\/ "0.30"<\/span><\/p>\n

    \u7279\u6b8a\u6ce8\u610f\u4e8b\u9879<\/h2>\n
  • toFixed() \u7684\u7cbe\u5ea6\u9677\u9631：<\/li>\n

    (<\/span>0.615<\/span>)<\/span>.<\/span>toFixed<\/span>(<\/span>2<\/span>)<\/span>;<\/span> \/\/ "0.61"（\u4e0d\u662f\u9884\u671f\u76840.62）<\/span>
    \n\/* \u539f\u56e0：
    \n \u5b9e\u9645\u5b58\u50a8\u503c：0.615 \u2192 0.61499999999999999
    \n \u820d\u5f03\u90e8\u5206：0.004999… < 0.005 \u2192 \u820d\u53bb
    \n*\/<\/span><\/p>\n

  • \u6d4f\u89c8\u5668\u517c\u5bb9\u6027：\n
      \n
    • \u6240\u6709\u73b0\u4ee3\u6d4f\u89c8\u5668\u90fd\u5b9e\u73b0\u4e86\u6b63\u786e\u7684\u94f6\u884c\u5bb6\u820d\u5165<\/li>\n
    • IE8 \u53ca\u66f4\u65e9\u7248\u672c\u7684 toFixed() \u6709\u9519\u8bef（\u5efa\u8baepolyfill）<\/li>\n<\/ul>\n<\/li>\n
    • \u7c7b\u578b\u8f6c\u6362\u6280\u5de7：<\/li>\n

      \/\/ \u83b7\u53d6\u6570\u5b57\u7c7b\u578b\u7684\u56fa\u5b9a\u5c0f\u6570\u4f4d\u7ed3\u679c<\/span>
      \nconst<\/span> numericResult =<\/span> +<\/span>(<\/span>(<\/span>0.1<\/span> +<\/span> 0.2<\/span>)<\/span>.<\/span>toFixed<\/span>(<\/span>2<\/span>)<\/span>)<\/span>;<\/span> \/\/ 0.3<\/span><\/p>\n

      \u6027\u80fd\u5bf9\u6bd4<\/h2>\n

      \u5728\u5927\u591a\u6570JavaScript\u5f15\u64ce\u4e2d：<\/p>\n

        \n
      • Math.round() \u6bd4 toFixed() \u5feb\u7ea6 8-10\u500d<\/li>\n
      • \u4f46\u5dee\u5f02\u4ec5\u5728\u767e\u4e07\u6b21\u64cd\u4f5c\u7ea7\u522b\u624d\u663e\u8457<\/li>\n<\/ul>\n

        \/\/ \u6027\u80fd\u6d4b\u8bd5\u793a\u4f8b<\/span>
        \nconst<\/span> testValue =<\/span> 2.555<\/span>;<\/span>
        \nlet<\/span> sum =<\/span> 0<\/span>;<\/span><\/p>\n

        console.<\/span>time<\/span>(<\/span>'Math.round'<\/span>)<\/span>;<\/span>
        \nfor<\/span> (<\/span>let<\/span> i =<\/span> 0<\/span>;<\/span> i <<\/span> 1000000<\/span>;<\/span> i++<\/span>)<\/span> {<\/span>
        \n sum +=<\/span> Math.<\/span>round<\/span>(<\/span>testValue)<\/span>;<\/span>
        \n}<\/span>
        \nconsole.<\/span>timeEnd<\/span>(<\/span>'Math.round'<\/span>)<\/span>;<\/span> \/\/ ~5ms<\/span><\/p>\n

        console.<\/span>time<\/span>(<\/span>'toFixed'<\/span>)<\/span>;<\/span>
        \nfor<\/span> (<\/span>let<\/span> i =<\/span> 0<\/span>;<\/span> i <<\/span> 1000000<\/span>;<\/span> i++<\/span>)<\/span> {<\/span>
        \n sum +=<\/span> +<\/span>testValue.<\/span>toFixed<\/span>(<\/span>0<\/span>)<\/span>;<\/span>
        \n}<\/span>
        \nconsole.<\/span>timeEnd<\/span>(<\/span>'toFixed'<\/span>)<\/span>;<\/span> \/\/ ~50ms<\/span><\/p>\n

        \u6700\u4f73\u5b9e\u8df5\u6307\u5357<\/h2>\n
      • \u91d1\u878d\u7cfb\u7edf：<\/li>\n

        \/\/ \u4f18\u5148\u4f7f\u7528 toFixed() \u663e\u793a<\/span>
        \nfunction<\/span> formatCurrency<\/span>(<\/span>value<\/span>)<\/span> {<\/span>
        \n return<\/span> `<\/span>$<\/span>${<\/span>value.<\/span>toFixed<\/span>(<\/span>2<\/span>)<\/span>}<\/span><\/span>`<\/span><\/span>;<\/span>
        \n}<\/span><\/p>\n

      • \u9700\u8981\u7cbe\u786e\u8ba1\u7b97\u7684\u573a\u666f：<\/li>\n

        \/\/ \u7ed3\u5408\u6574\u6570\u8fd0\u7b97\u907f\u514d\u7cbe\u5ea6\u95ee\u9898<\/span>
        \nfunction<\/span> preciseRound<\/span>(<\/span>num,<\/span> decimals<\/span>)<\/span> {<\/span>
        \n const<\/span> factor =<\/span> 10<\/span> **<\/span> decimals;<\/span>
        \n return<\/span> Math.<\/span>round<\/span>(<\/span>num *<\/span> factor)<\/span> \/<\/span> factor;<\/span>
        \n}<\/span><\/p>\n

      • UI\u663e\u793a：<\/li>\n

        \/\/ \u6839\u636e\u573a\u666f\u9009\u62e9\u5408\u9002\u7684\u820d\u5165\u65b9\u6cd5<\/span>
        \nfunction<\/span> displayRounded<\/span>(<\/span>value,<\/span> decimalPlaces<\/span>)<\/span> {<\/span>
        \n if<\/span> (<\/span>decimalPlaces ===<\/span> 0<\/span>)<\/span> {<\/span>
        \n return<\/span> Math.<\/span>round<\/span>(<\/span>value)<\/span>.<\/span>toString<\/span>(<\/span>)<\/span>;<\/span>
        \n }<\/span>
        \n return<\/span> value.<\/span>toFixed<\/span>(<\/span>decimalPlaces)<\/span>;<\/span>
        \n}<\/span><\/p>\n

      • \u6bd4\u8f83\u6d6e\u70b9\u6570：<\/li>\n

        \/\/ \u4e0d\u8981\u4f9d\u8d56\u820d\u5165\u540e\u7684\u503c\u505a\u7cbe\u786e\u6bd4\u8f83<\/span>
        \nfunction<\/span> floatEqual<\/span>(<\/span>a,<\/span> b,<\/span> epsilon =<\/span> 0.0001<\/span><\/span>)<\/span> {<\/span>
        \n return<\/span> Math.<\/span>abs<\/span>(<\/span>a –<\/span> b)<\/span> <<\/span> epsilon;<\/span>
        \n}<\/span><\/p>\n

        \u7ed3\u8bba<\/h2>\n

        Math.round() \u548c Number.toFixed() \u7684\u6839\u672c\u533a\u522b\u5728\u4e8e：<\/p>\n

          \n
        • \u820d\u5165\u89c4\u5219：\u4f20\u7edf\u56db\u820d\u4e94\u5165 vs \u94f6\u884c\u5bb6\u820d\u5165<\/li>\n
        • \u8fd4\u56de\u503c：\u6570\u5b57 vs \u5b57\u7b26\u4e32<\/li>\n
        • \u4f7f\u7528\u573a\u666f：\u7b80\u5355\u53d6\u6574 vs \u7cbe\u786e\u5c0f\u6570\u63a7\u5236<\/li>\n<\/ul>\n

          \u9009\u62e9\u5efa\u8bae：<\/p>\n

            \n
          • \u9700\u8981\u63a7\u5236\u5c0f\u6570\u4f4d\u6570 \u2192 toFixed()<\/li>\n
          • \u9700\u8981\u6574\u6570\u7ed3\u679c\u4e14\u7b26\u5408\u4f20\u7edf\u56db\u820d\u4e94\u5165 \u2192 Math.round()<\/li>\n
          • \u91d1\u878d\u8ba1\u7b97 \u2192 \u4f18\u5148 toFixed() \u663e\u793a，\u5185\u90e8\u8ba1\u7b97\u7528\u6574\u6570\u8fd0\u7b97<\/li>\n
          • \u6027\u80fd\u5173\u952e\u8def\u5f84 \u2192 Math.round()<\/li>\n<\/ul>\n

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