{"id":12057,"date":"2023-11-28T22:41:32","date_gmt":"2023-11-28T14:41:32","guid":{"rendered":"https:\/\/wx.kaifamiao.info\/?p=12057"},"modified":"2023-11-30T17:49:12","modified_gmt":"2023-11-30T09:49:12","slug":"javascript-zhong-qiang-zhi-zhuan-huan-xian-shi-zhu","status":"publish","type":"post","link":"http:\/\/wx.kaifamiao.info\/index.php\/2023\/11\/28\/javascript-zhong-qiang-zhi-zhuan-huan-xian-shi-zhu\/","title":{"rendered":"JavaScript \u4e2d\u5f3a\u5236\u8f6c\u6362\u663e\u5f0f\u8f6c\u6362\u9690\u5f0f\u8f6c\u6362\uff1f"},"content":{"rendered":"<p>\u5728 JavaScript \u4e2d\uff0c\u7c7b\u578b\u8f6c\u6362\u662f\u6307\u5c06\u4e00\u4e2a\u6570\u636e\u7c7b\u578b\u8f6c\u6362\u4e3a\u53e6\u4e00\u4e2a\u6570\u636e\u7c7b\u578b\u7684\u8fc7\u7a0b\u3002\u7c7b\u578b\u8f6c\u6362\u53ef\u4ee5\u5206\u4e3a\u4e24\u79cd\uff1a\u663e\u5f0f\u8f6c\u6362\u548c\u9690\u5f0f\u8f6c\u6362\u3002<\/p>\n<h3><a id=\"%E6%98%BE%E5%BC%8F%E8%BD%AC%E6%8D%A2%EF%BC%88explicit-conversion%EF%BC%89%EF%BC%9A\" class=\"anchor\" aria-hidden=\"true\"><span class=\"octicon octicon-link\"><\/span><\/a>\u663e\u5f0f\u8f6c\u6362\uff08Explicit Conversion\uff09\uff1a<\/h3>\n<p>\u663e\u5f0f\u8f6c\u6362\u662f\u901a\u8fc7\u7279\u5b9a\u7684\u51fd\u6570\u6216\u64cd\u4f5c\u7b26\u660e\u786e\u5730\u5c06\u4e00\u4e2a\u6570\u636e\u7c7b\u578b\u8f6c\u6362\u4e3a\u53e6\u4e00\u4e2a\u6570\u636e\u7c7b\u578b\u3002\u5728 JavaScript \u4e2d\uff0c\u5e38\u89c1\u7684\u663e\u5f0f\u8f6c\u6362\u5305\u62ec\uff1a<\/p>\n<ul>\n<li><strong>parseInt() \u548c parseFloat()<\/strong>\uff1a\u7528\u4e8e\u5c06\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u6574\u6570\u6216\u6d6e\u70b9\u6570\u3002<\/li>\n<li><strong>Number()\u3001String()\u3001Boolean()<\/strong>\uff1a\u7528\u4e8e\u5c06\u503c\u8f6c\u6362\u4e3a\u6570\u5b57\u3001\u5b57\u7b26\u4e32\u6216\u5e03\u5c14\u503c\u3002<\/li>\n<li><strong>String concatenation\uff08\u5b57\u7b26\u4e32\u62fc\u63a5\uff09<\/strong>\uff1a\u4f7f\u7528\u5b57\u7b26\u4e32\u8fde\u63a5\u7b26\uff08+\uff09\u5c06\u975e\u5b57\u7b26\u4e32\u503c\u8f6c\u6362\u4e3a\u5b57\u7b26\u4e32\u3002<\/li>\n<li><strong>Type coercion<\/strong>\uff1a\u4f7f\u7528\u53cc\u91cd\u5426\u5b9a\u64cd\u4f5c\u7b26\uff08!!\uff09\u5c06\u503c\u8f6c\u6362\u4e3a\u5e03\u5c14\u503c\uff0c\u6216\u4f7f\u7528\u4e00\u5143\u52a0\u53f7\uff08+\uff09\u5c06\u503c\u8f6c\u6362\u4e3a\u6570\u5b57\u3002<\/li>\n<\/ul>\n<p>\u793a\u4f8b\uff1a<\/p>\n<pre><code class=\"language-javascript\">let numString = '10';\nlet num = parseInt(numString); \/\/ \u663e\u5f0f\u8f6c\u6362\u4e3a\u6574\u6570\n\nlet x = 5;\nlet y = '10';\nlet result = x + Number(y); \/\/ \u663e\u5f0f\u5c06 y \u8f6c\u6362\u4e3a\u6570\u5b57\u540e\u76f8\u52a0\n<\/code><\/pre>\n<h3><a id=\"%E9%9A%90%E5%BC%8F%E8%BD%AC%E6%8D%A2%EF%BC%88implicit-conversion%EF%BC%89%EF%BC%9A\" class=\"anchor\" aria-hidden=\"true\"><span class=\"octicon octicon-link\"><\/span><\/a>\u9690\u5f0f\u8f6c\u6362\uff08Implicit Conversion\uff09\uff1a<\/h3>\n<p>\u9690\u5f0f\u8f6c\u6362\u662f JavaScript \u5728\u8fd0\u884c\u65f6\u81ea\u52a8\u6267\u884c\u7684\u7c7b\u578b\u8f6c\u6362\u3002\u5f53\u8fdb\u884c\u67d0\u4e9b\u64cd\u4f5c\u65f6\uff0cJavaScript \u5f15\u64ce\u4f1a\u9690\u5f0f\u5730\u5c06\u4e00\u4e2a\u6570\u636e\u7c7b\u578b\u8f6c\u6362\u4e3a\u53e6\u4e00\u4e2a\u6570\u636e\u7c7b\u578b\u3002\u5e38\u89c1\u7684\u9690\u5f0f\u8f6c\u6362\u5305\u62ec\uff1a<\/p>\n<ul>\n<li><strong>\u7b97\u672f\u8fd0\u7b97\u7b26<\/strong>\uff1a\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\uff0cJavaScript \u4f1a\u81ea\u52a8\u5c06\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u6570\u5b57\u8fdb\u884c\u8fd0\u7b97\u3002<\/li>\n<li><strong>\u6bd4\u8f83\u64cd\u4f5c\u7b26<\/strong>\uff1a\u5728\u4f7f\u7528\u6bd4\u8f83\u64cd\u4f5c\u7b26\u65f6\uff0cJavaScript \u4f1a\u8fdb\u884c\u7c7b\u578b\u8f6c\u6362\u4ee5\u8fdb\u884c\u6bd4\u8f83\u3002<\/li>\n<li><strong>\u903b\u8f91\u8fd0\u7b97\u7b26<\/strong>\uff1a\u5c06\u975e\u5e03\u5c14\u503c\u8f6c\u6362\u4e3a\u5e03\u5c14\u503c\u8fdb\u884c\u903b\u8f91\u8fd0\u7b97\u3002<\/li>\n<li><strong>\u5b57\u7b26\u4e32\u62fc\u63a5<\/strong>\uff1a\u5f53\u4e00\u4e2a\u5b57\u7b26\u4e32\u548c\u975e\u5b57\u7b26\u4e32\u76f8\u52a0\u65f6\uff0c\u975e\u5b57\u7b26\u4e32\u4f1a\u88ab\u8f6c\u6362\u4e3a\u5b57\u7b26\u4e32\u7136\u540e\u8fdb\u884c\u62fc\u63a5\u3002<\/li>\n<\/ul>\n<p>\u793a\u4f8b\uff1a<\/p>\n<pre><code class=\"language-javascript\">let a = 5 + '10'; \/\/ \u9690\u5f0f\u5c06\u6570\u5b57\u8f6c\u6362\u4e3a\u5b57\u7b26\u4e32\u540e\u62fc\u63a5\nlet b = '3' * 2; \/\/ \u9690\u5f0f\u5c06\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u6570\u5b57\u8fdb\u884c\u4e58\u6cd5\u8fd0\u7b97\n<\/code><\/pre>\n<p>\u9690\u5f0f\u8f6c\u6362\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\u53ef\u80fd\u4f1a\u5bfc\u81f4\u610f\u5916\u7684\u884c\u4e3a\uff0c\u56e0\u6b64\u5728\u7f16\u5199\u4ee3\u7801\u65f6\u9700\u8981\u6ce8\u610f\u9690\u5f0f\u7c7b\u578b\u8f6c\u6362\u53ef\u80fd\u5e26\u6765\u7684\u5f71\u54cd\uff0c\u4ee5\u907f\u514d\u4e0d\u5fc5\u8981\u7684\u9519\u8bef\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5728 JavaScript \u4e2d\uff0c\u7c7b\u578b\u8f6c\u6362\u662f\u6307\u5c06\u4e00\u4e2a\u6570\u636e\u7c7b\u578b\u8f6c\u6362\u4e3a\u53e6\u4e00\u4e2a\u6570\u636e\u7c7b\u578b\u7684\u8fc7\u7a0b\u3002\u7c7b\u578b\u8f6c\u6362\u53ef\u4ee5\u5206\u4e3a\u4e24\u79cd\uff1a\u663e\u5f0f [&hellip;]<\/p>\n","protected":false},"author":11,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[115],"tags":[],"class_list":["post-12057","post","type-post","status-publish","format-standard","hentry","category-javascript"],"_links":{"self":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/12057","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/users\/11"}],"replies":[{"embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/comments?post=12057"}],"version-history":[{"count":2,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/12057\/revisions"}],"predecessor-version":[{"id":13610,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/12057\/revisions\/13610"}],"wp:attachment":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/media?parent=12057"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/categories?post=12057"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/tags?post=12057"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}