{"id":93248,"date":"2020-04-01T00:32:01","date_gmt":"2020-03-31T16:32:01","guid":{"rendered":"http:\/\/4563.org\/?p=93248"},"modified":"2020-04-01T00:32:01","modified_gmt":"2020-03-31T16:32:01","slug":"js-%e6%b7%b7%e5%90%88%e6%8b%bc%e6%8e%a5%e5%ba%94%e8%af%a5%e7%94%a8-%e8%bf%98%e6%98%af-string-%e6%96%b9%e6%b3%95%e5%a4%84%e7%90%86%e8%ae%a1%e7%ae%97%e4%bc%98%e5%85%88%e7%ba%a7%ef%bc%9f","status":"publish","type":"post","link":"http:\/\/4563.org\/?p=93248","title":{"rendered":"js \u6df7\u5408\u62fc\u63a5\u5e94\u8be5\u7528 () \u8fd8\u662f String() \u65b9\u6cd5\u5904\u7406\u8ba1\u7b97\u4f18\u5148\u7ea7\uff1f"},"content":{"rendered":"
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js \u6df7\u5408\u62fc\u63a5\u5e94\u8be5\u7528 () \u8fd8\u662f String() \u65b9\u6cd5\u5904\u7406\u8ba1\u7b97\u4f18\u5148\u7ea7\uff1f <\/h1>\n

<\/p>\n

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\u8cc7\u6df1\u5927\u4f6c : lisisi <\/span> <\/i> 26<\/span> <\/div>\n
<\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n
<\/p>\n

js \u6df7\u5408\u62fc\u63a5\u7684\u987a\u5e8f\u5dee\u5f02\uff0c\u5bfc\u81f4\u7ed3\u679c\u5dee\u522b\u8fd9\u4e48\u5927\uff0c\u4e3a\u4ec0\u4e48 js \u8fd9\u4e48\u8bbe\u8ba1\uff1f\u8981\u907f\u514d\u8fd9\u79cd\u6df7\u5408\u5904\u7406\u7684\u5dee\u5f02\uff0c\u5e94\u8be5\u7528 () \u8fd8\u662f String() \u65b9\u6cd5\u5904\u7406\u8ba1\u7b97\u4f18\u5148\u7ea7\uff1f<\/p>\n

3 * 0.3 + 1 + 'foo' => 1.9foo  'foo' + 3 * 0.3 + 1 => foo0.8999 \u4e5d 99999 \u4e5d 999991 <\/code><\/pre>\n<\/p><\/div>\n
 \u5927\u4f6c\u6709\u8a71\u8aaa<\/b> (13<\/span>)        <\/div>\n
 <\/div>\n<\/p><\/div>\n<\/p><\/div>\n
    \n
  • \n
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     \u8cc7\u6df1\u5927\u4f6c : wobuhuicode <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u8fd9\u662f\u5408\u7406\u7684\u8bbe\u8ba1\uff0cJS \u4e0d\u662f\u5f3a\u7c7b\u578b\u8bed\u8a00\uff0c\u4f46\u662f\u4e5f\u662f\u6709\u7c7b\u578b\u7684\u3002 + \u53f7\u662f\u6839\u636e\u7c7b\u578b\u6765\u8fdb\u884c\u8fd0\u7b97\u7684\u3002
    \u5b57\u7b26\u4e32\u62fc\u63a5\u7528 `string${a}` \u8fd9\u79cd\u8bed\u6cd5\u5c31\u597d\u4e86                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
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     \u4e3b<\/span> \u8cc7\u6df1\u5927\u4f6c : lisisi <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 @wobuhuicode \u4e0d\u662f String() \u548c toString() \u5417\uff1f<\/p>\n
    \u5c0f\u5199 string${a} \u662f\u4ec0\u4e48\u8bed\u6cd5\uff1f                                                            <\/p><\/div>\n<\/p><\/div>\n<\/li>\n
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     \u8cc7\u6df1\u5927\u4f6c : tyx1703 <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 @lisisi \u8fd9\u662f\u5b57\u7b26\u4e32\u6a21\u677f\uff0ces6 \u7684\u65b0\u8bed\u6cd5                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
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     \u8cc7\u6df1\u5927\u4f6c : seki <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 1 \u8bf4\u7684\u662f\u6a21\u677f\u5b57\u7b26\u4e32
    https:\/\/developer.mozilla.org\/zh-CN\/docs\/Web\/JavaScript\/Reference\/template_strings<\/p>\n
    \u5982\u679c\u8981\u95ee\u4e3a\u4ec0\u4e48\u8fd9\u4e48\u8bbe\u8ba1\uff0c\u7b54\u6848\u5c31\u662f\u8fd9\u662f js \u7cdf\u7c95\u90e8\u5206\u3002\u5efa\u8bae\u5b8c\u5168\u653e\u5f03\u52a0\u53f7\u62fc\u63a5\u5b57\u7b26\u4e32\u7684\u884c\u4e3a                                                            <\/p><\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
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     \u8cc7\u6df1\u5927\u4f6c : xcstream <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 var a = 1
    var b= `${a}`                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
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     \u8cc7\u6df1\u5927\u4f6c : SoloCompany <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 1. \u80fd\u7528 es6 \u5c3d\u91cf\u7528 template string
    2. \u4e0d\u80fd\u7528 es6 \u7684\u5b57\u7b26\u4e32\u4e32\u63a5\u53ef\u4ee5\u9009\u62e9
     2.1 \u5f00\u5934\u52a0\u4e00\u4e2a ” +
     2.2 \u7528 Array.prototype.join                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
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     \u8cc7\u6df1\u5927\u4f6c : rabbbit <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u54ea\u4e2a\u7b26\u53f7\u4f18\u5148\u7ea7\u9ad8\u5c31\u7b97\u54ea\u4e2a<\/p>\n
    ‘foo’ + 3 * 3 \/\/ “foo9”<\/p>\n
    \u7136\u540e\u4e0d\u540c\u7c7b\u578b\u76f8\u52a0\u4f1a\u81ea\u52a8\u8f6c\u6362\u7c7b\u578b,\u5c31\u5168\u4e71\u5957\u4e86. <\/p>\n
    ‘a’ + 1 \/\/ a1
    ‘a’ + true \/\/ “atrue”
    ‘a’ + null \/\/ “anull”
    ‘a’ + undefined \/\/ “aundefined”<\/p>\n
    1 + true \/\/ 2
    1 + undefined \/\/ NaN
    1 + null \/\/ 1<\/p>\n
    [] + 1\/\/ “1”
    [] + ‘a’ \/\/ “a”<\/p>\n
    {} + 1 \/\/ 1<\/p>\n
    ({}) + 1 \/\/ “[object Object]1”<\/p>\n
    \u6240\u4ee5\u6700\u597d\u7528\u6a21\u677f\u5b57\u7b26\u4e32,\u800c\u4e0d\u662f\u52a0\u53f7                                                            <\/p><\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
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     \u8cc7\u6df1\u5927\u4f6c : xiangyuecn <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u4e58\u6cd5\u4f18\u5148\u7ea7\u6bd4\u52a0\u6cd5\u9ad8\uff0c\u5148\u8fd0\u7b97\u4e58\u6cd5\u3002\u76f8\u540c\u7684\u52a0\u6cd5\u4ece\u5de6\u5f80\u53f3\u4e00\u8def\u52a0\u8fc7\u53bb\u3002\u8fd9\u4e2a\u7ed3\u679c\u6ca1\u6bdb\u75c5<\/p>\n
    \u53e6\u5916\u4e00\u5768 9999 \u7684\uff0c\u5176\u5b9e\u4e5f\u6ca1\u6bdb\u75c5\u3002\u9605\u8bfb\uff1a http:\/\/0.30000000000000004.com\/                                                            <\/p><\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
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     \u8cc7\u6df1\u5927\u4f6c : xiangyuecn <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
     \"js <\/p>\n
    \"js <\/div>\n<\/p><\/div>\n<\/li>\n
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     \u8cc7\u6df1\u5927\u4f6c : DOLLOR <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 3 * 0.3 + 1 + ‘foo’ 
    => 0.8999999999999999 + 1 + ‘foo’ 
    => 1.9 + ‘foo’ 
    =>”1.9foo”<\/p>\n
    ‘foo’ + 3 * 0.3 + 1
    =>’foo’ + 0.8999999999999999 + 1
    =>”foo0.8999999999999999″ + 1
    =>”foo0.89999999999999991″<\/p>\n
    \u4e3a\u4ec0\u4e48\u8fd9\u4e48\u8bbe\u8ba1\uff0c\u5f53\u7136\u662f\u56e0\u4e3a\u5148\u4e58\u9664\u540e\u52a0\u51cf\uff0c\u66f4\u7b26\u5408\u5b66\u8fc7\u6570\u5b66\u7684\u4eba\u7684\u601d\u7ef4\u3002
    \u800c\u201c+\u201d\u65e2\u53ef\u4ee5\u4f5c\u4e3a\u6570\u5b66\u7684\u52a0\u6cd5\u8fd0\u7b97\uff0c\u4e5f\u53ef\u4ee5\u4f5c\u4e3a\u5b57\u7b26\u4e32\u7684\u62fc\u63a5\u8fd0\u7b97\u3002\u5f53\u4f60\u7528\u201c+\u201d\u6765\u6df7\u5408\u64cd\u4f5c String \u548c Number \u65f6\uff0c\u4f1a\u628a Number \u8f6c\u4e3a String\uff0c\u518d\u8ddf\u53e6\u4e00\u4e2a String \u505a\u62fc\u63a5\u8fd0\u7b97\u3002<\/p>\n
    \u8981\u5c3d\u91cf\u907f\u514d\u7528\u6570\u5b66\u64cd\u4f5c\u7b26\u6765\u76f4\u63a5\u64cd\u4f5c\u975e Number \u6570\u636e\u7c7b\u578b\uff0c\u4ee5\u514d\u51fa\u73b0\u4e0d\u53ef\u9884\u77e5\u7684\u9690\u5f0f\u8f6c\u6362\u3002
    \u5b57\u7b26\u4e32\u7684\u62fc\u63a5\u5c3d\u91cf\u7528\u5b57\u7b26\u4e32\u6a21\u677f\uff08`${}`\uff09\uff0c\u907f\u514d\u7528\u201c+\u201d\u62fc\u63a5\u3002                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
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     \u8cc7\u6df1\u5927\u4f6c : citrix <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u5f00\u542f eslint-config-airbnb, \u8fd9\u4e9b\u7f16\u7a0b\u89c4\u8303\u7684\u4e8b\u60c5\u4ea4\u7ed9 lint \u6765 fix \u5c31\u597d\u4e86                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
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     \u8cc7\u6df1\u5927\u4f6c : christin <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 +\u65e2\u53ef\u4ee5\u7528\u4f5c\u6570\u5b57\u8fd0\u7b97\u4e5f\u53ef\u4ee5\u5b57\u7b26\u4e32\u62fc\u63a5\u3002\u7b2c\u4e00\u4e2a\u524d\u9762\u662f\u6570\u5b57\u540e\u9762\u662f\u5b57\u7b26\u5c31\u5148\u6570\u5b57\u8fd0\u7b97\u518d\u5b57\u7b26\u62fc\u63a5\u3002\u7b2c\u4e8c\u4e2a \u5f00\u59cb\u5c31\u662f\u5b57\u7b26\u5c31\u4e00\u76f4\u5b57\u7b26\u62fc\u63a5                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
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     \u8cc7\u6df1\u5927\u4f6c : crz <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 @rabbbit \u7c7b\u578b\u8f6c\u6362\u7684\u95ee\u9898\u6a21\u677f\u5b57\u7b26\u4e32\u5176\u5b9e\u4e0d\u89e3\u51b3                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n","protected":false},"excerpt":{"rendered":"
    js \u6df7\u5408\u62fc\u63a5\u5e94\u8be5\u7528 () \u8fd8\u662f …<\/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\/93248"}],"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=93248"}],"version-history":[{"count":0,"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts\/93248\/revisions"}],"wp:attachment":[{"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=93248"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=93248"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=93248"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}