{"id":8314,"date":"2023-11-28T20:24:32","date_gmt":"2023-11-28T12:24:32","guid":{"rendered":"https:\/\/wx.kaifamiao.info\/?p=8314"},"modified":"2023-12-02T22:30:07","modified_gmt":"2023-12-02T14:30:07","slug":"vue-zhongcomputed-hewatch-de-yong-fa-he-qu-bie","status":"publish","type":"post","link":"http:\/\/wx.kaifamiao.info\/index.php\/2023\/11\/28\/vue-zhongcomputed-hewatch-de-yong-fa-he-qu-bie\/","title":{"rendered":"Vue \u4e2d computed \u548c watch \u7684\u7528\u6cd5\u548c\u533a\u522b\uff1f"},"content":{"rendered":"<p>\u5728 Vue \u4e2d\uff0c<code>computed<\/code> \u548c <code>watch<\/code> \u90fd\u662f\u7528\u4e8e\u76d1\u542c\u6570\u636e\u53d8\u5316\u7684\u529f\u80fd\uff0c\u4f46\u5b83\u4eec\u7684\u7528\u6cd5\u548c\u4f5c\u7528\u6709\u6240\u4e0d\u540c\u3002<\/p>\n<h3><a id=\"computed%E5%B1%9E%E6%80%A7%EF%BC%9A\" class=\"anchor\" aria-hidden=\"true\"><span class=\"octicon octicon-link\"><\/span><\/a>Computed \u5c5e\u6027\uff1a<\/h3>\n<ul>\n<li>\n<p><strong>\u7528\u6cd5\uff1a<\/strong> \u5728 Vue \u7ec4\u4ef6\u4e2d\u4f7f\u7528 <code>computed<\/code> \u5c5e\u6027\u5b9a\u4e49\u8ba1\u7b97\u5c5e\u6027\u3002<\/p>\n<\/li>\n<li>\n<p><strong>\u7279\u70b9\uff1a<\/strong> \u8ba1\u7b97\u5c5e\u6027\u662f\u57fa\u4e8e\u5b83\u4eec\u7684\u4f9d\u8d56\u8fdb\u884c\u7f13\u5b58\u7684\uff0c\u53ea\u6709\u5728\u4f9d\u8d56\u53d1\u751f\u53d8\u5316\u65f6\u624d\u4f1a\u91cd\u65b0\u8ba1\u7b97\u3002<\/p>\n<\/li>\n<li>\n<p><strong>\u9002\u7528\u573a\u666f\uff1a<\/strong> \u9002\u5408\u5904\u7406\u57fa\u4e8e\u5df2\u6709\u7684\u54cd\u5e94\u5f0f\u6570\u636e\u8ba1\u7b97\u800c\u6765\u7684\u5c5e\u6027\uff0c\u5982\u5bf9\u6570\u636e\u7684\u52a0\u5de5\u3001\u7b5b\u9009\u3001\u6392\u5e8f\u7b49\u64cd\u4f5c\u3002<\/p>\n<\/li>\n<\/ul>\n<pre><code class=\"language-vue\">&lt;template&gt;\n  &lt;div&gt;\n    &lt;p&gt;{{ message }}&lt;\/p&gt;\n    &lt;input v-model=&quot;inputValue&quot;&gt;\n  &lt;\/div&gt;\n&lt;\/template&gt;\n\n&lt;script&gt;\nexport default {\n  data() {\n    return {\n      inputValue: 'Hello',\n    };\n  },\n  computed: {\n    message() {\n      return this.inputValue.toUpperCase();\n    },\n  },\n};\n&lt;\/script&gt;\n<\/code><\/pre>\n<h3><a id=\"watch%E5%B1%9E%E6%80%A7%EF%BC%9A\" class=\"anchor\" aria-hidden=\"true\"><span class=\"octicon octicon-link\"><\/span><\/a>Watch \u5c5e\u6027\uff1a<\/h3>\n<ul>\n<li>\n<p><strong>\u7528\u6cd5\uff1a<\/strong> \u5728 Vue \u7ec4\u4ef6\u4e2d\u4f7f\u7528 <code>watch<\/code> \u5c5e\u6027\u76d1\u542c\u6570\u636e\u7684\u53d8\u5316\u3002<\/p>\n<\/li>\n<li>\n<p><strong>\u7279\u70b9\uff1a<\/strong> Watch \u4fa6\u542c\u7279\u5b9a\u7684\u6570\u636e\u53d8\u5316\uff0c\u5e76\u5728\u6570\u636e\u53d8\u5316\u65f6\u6267\u884c\u56de\u8c03\u51fd\u6570\u3002<\/p>\n<\/li>\n<li>\n<p><strong>\u9002\u7528\u573a\u666f\uff1a<\/strong> \u9002\u5408\u89c2\u5bdf\u67d0\u4e2a\u7279\u5b9a\u6570\u636e\u7684\u53d8\u5316\uff0c\u5e76\u6267\u884c\u4e00\u4e9b\u5f02\u6b65\u6216\u590d\u6742\u64cd\u4f5c\u3002<\/p>\n<\/li>\n<\/ul>\n<pre><code class=\"language-vue\">&lt;template&gt;\n  &lt;div&gt;\n    &lt;p&gt;{{ message }}&lt;\/p&gt;\n    &lt;input v-model=&quot;inputValue&quot;&gt;\n  &lt;\/div&gt;\n&lt;\/template&gt;\n\n&lt;script&gt;\nexport default {\n  data() {\n    return {\n      inputValue: 'Hello',\n      message: '',\n    };\n  },\n  watch: {\n    inputValue(newVal, oldVal) {\n      this.message = newVal.toUpperCase();\n    },\n  },\n};\n&lt;\/script&gt;\n<\/code><\/pre>\n<h3><a id=\"%E5%8C%BA%E5%88%AB%EF%BC%9A\" class=\"anchor\" aria-hidden=\"true\"><span class=\"octicon octicon-link\"><\/span><\/a>\u533a\u522b\uff1a<\/h3>\n<ol>\n<li>\n<p><strong>\u7f13\u5b58\u4e0e\u5426\uff1a<\/strong> <code>computed<\/code> \u5c5e\u6027\u662f\u57fa\u4e8e\u5b83\u4eec\u7684\u4f9d\u8d56\u8fdb\u884c\u7f13\u5b58\u7684\uff0c\u53ea\u6709\u4f9d\u8d56\u53d1\u751f\u53d8\u5316\u65f6\u624d\u4f1a\u91cd\u65b0\u8ba1\u7b97\uff1b\u800c <code>watch<\/code> \u76d1\u542c\u7279\u5b9a\u6570\u636e\u7684\u53d8\u5316\uff0c\u5728\u6bcf\u6b21\u6570\u636e\u53d8\u5316\u65f6\u90fd\u4f1a\u6267\u884c\u56de\u8c03\u3002<\/p>\n<\/li>\n<li>\n<p><strong>\u4f7f\u7528\u573a\u666f\uff1a<\/strong> <code>computed<\/code> \u9002\u5408\u5904\u7406\u9700\u8981\u57fa\u4e8e\u5df2\u6709\u54cd\u5e94\u5f0f\u6570\u636e\u8ba1\u7b97\u800c\u6765\u7684\u5c5e\u6027\uff1b<code>watch<\/code> \u9002\u5408\u89c2\u5bdf\u548c\u54cd\u5e94\u7279\u5b9a\u6570\u636e\u7684\u53d8\u5316\uff0c\u6267\u884c\u4e00\u4e9b\u903b\u8f91\u64cd\u4f5c\u3002<\/p>\n<\/li>\n<\/ol>\n<p>\u5728\u9009\u62e9\u4f7f\u7528\u65f6\uff0c\u6839\u636e\u9700\u8981\u8ba1\u7b97\u7684\u5c5e\u6027\u662f\u5426\u57fa\u4e8e\u54cd\u5e94\u5f0f\u6570\u636e\u4ee5\u53ca\u9700\u8981\u6267\u884c\u7684\u903b\u8f91\u64cd\u4f5c\u6765\u51b3\u5b9a\u4f7f\u7528 <code>computed<\/code> \u8fd8\u662f <code>watch<\/code>\u3002\u901a\u5e38\u60c5\u51b5\u4e0b\uff0c\u4f18\u5148\u4f7f\u7528 <code>computed<\/code>\uff0c\u53ea\u6709\u5728\u9700\u8981\u76d1\u542c\u7279\u5b9a\u6570\u636e\u53d8\u5316\u5e76\u6267\u884c\u4e00\u4e9b\u590d\u6742\u64cd\u4f5c\u65f6\u624d\u4f7f\u7528 <code>watch<\/code>\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5728 Vue \u4e2d\uff0ccomputed \u548c watch \u90fd\u662f\u7528\u4e8e\u76d1\u542c\u6570\u636e\u53d8\u5316\u7684\u529f\u80fd\uff0c\u4f46\u5b83\u4eec\u7684\u7528\u6cd5\u548c\u4f5c\u7528\u6709\u6240\u4e0d\u540c\u3002 C [&hellip;]<\/p>\n","protected":false},"author":11,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[114],"tags":[],"class_list":["post-8314","post","type-post","status-publish","format-standard","hentry","category-vue"],"_links":{"self":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/8314","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=8314"}],"version-history":[{"count":2,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/8314\/revisions"}],"predecessor-version":[{"id":14092,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/8314\/revisions\/14092"}],"wp:attachment":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/media?parent=8314"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/categories?post=8314"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/tags?post=8314"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}