{"id":573,"date":"2020-04-28T16:46:28","date_gmt":"2020-04-28T08:46:28","guid":{"rendered":"https:\/\/wp.winter-weng.cc\/work\/?p=573"},"modified":"2021-03-06T16:09:10","modified_gmt":"2021-03-06T08:09:10","slug":"vue-watch","status":"publish","type":"post","link":"https:\/\/wp.winter-weng.cc\/work\/?p=573","title":{"rendered":"[Vue] watch"},"content":{"rendered":"\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>\u672c\u7bc7\u70ba\u300a<a rel=\"noreferrer noopener\" href=\"https:\/\/medium.com\/unalai\/%E8%AA%8D%E8%AD%98-vue-js-watch-%E7%9B%A3%E8%81%BD%E5%99%A8-ffee991368be\" target=\"_blank\">\u8a8d\u8b58 Vue.js watch \u76e3\u807d\u5668<\/a>\u300b\u7684\u6458\u8981\uff0c\u8acb\u67e5\u770b\u539f\u6587\u7ae0\u3002<\/p><\/blockquote>\n\n\n<p>Vue \u53ef\u4f7f\u7528 watch \u89c0\u6e2c\u8cc7\u6599\uff0c\u5728\u8cc7\u6599\u8b8a\u5316\u6642\u505a\u4e00\u4e9b\u61c9\u5c0d\u3002<\/p>\n\n\n<p>\u7528\u6cd5\u4e5f\u5f88\u76f4\u89ba\uff1a<\/p>\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"js\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">data() {\n    return {\n        test: 0\n    }\n}\nwatch: {\n    test: function(old, new) { \/\/ watch data, computed\n        console.log('changed')\n    },\n    '$store.state.id'(val) {  \/\/ watch object.key\n        this.doSomething(val)\n    }\n}<\/pre>\n\n\n<hr class=\"wp-block-separator\" \/>\n\n\n<h4 class=\"wp-block-heading\">options<\/h4>\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">watch: {\n    test: {\n        handler: function() {\n            console.log('changed')\n        }\n        deep: true,\n        immediate: true\n    }\n}<\/pre>\n\n\n<ul class=\"wp-block-list\"><li>deep<br \/>\u7576\u6b32\u89c0\u5bdf\u503c\u7684\u7279\u6027\u70ba call by reference\uff0c\u4f8b\u5982 Object \u6642\uff0c\u9700\u5c07 deep \u503c\u8a2d\u5b9a\u70ba true\uff0c\u544a\u77e5 watch \u9700\u8981\u6df1\u5ea6\u89c0\u5bdf\u3002\u5426\u5247\u6703\u56e0\u70ba\u7279\u6027\u95dc\u4fc2\uff0c\u7121\u6cd5\u89f8\u767c\u76e3\u807d\u5668\u3002<\/li><li> immediate<br \/>\u76e3\u807d\u5668\u9810\u8a2d\u70ba\u7576\u503c\u6709\u6240\u8b8a\u5316\u6642\u624d\u6703\u89f8\u767c\u3002\u5982\u679c\u6211\u5011\u5e0c\u671b\u5728\u521d\u59cb\u5316\u5b8c\u6210\u5f8c\uff0c\u5c31\u5148\u89f8\u767c\uff0c\u57f7\u884c handler\uff0c\u5c31\u53ef\u4ee5\u5c07 immediate \u503c\u8a2d\u70ba true\u3002<\/li><\/ul>\n","protected":false},"excerpt":{"rendered":"<p>\u672c\u7bc7\u70ba\u300a\u8a8d\u8b58 Vue.js watch \u76e3\u807d\u5668\u300b\u7684&hellip;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"pgc_sgb_lightbox_settings":"","footnotes":""},"categories":[5],"tags":[35],"class_list":["post-573","post","type-post","status-publish","format-standard","hentry","category-vue","tag-35"],"_links":{"self":[{"href":"https:\/\/wp.winter-weng.cc\/work\/index.php?rest_route=\/wp\/v2\/posts\/573","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/wp.winter-weng.cc\/work\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/wp.winter-weng.cc\/work\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/wp.winter-weng.cc\/work\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/wp.winter-weng.cc\/work\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=573"}],"version-history":[{"count":1,"href":"https:\/\/wp.winter-weng.cc\/work\/index.php?rest_route=\/wp\/v2\/posts\/573\/revisions"}],"predecessor-version":[{"id":609,"href":"https:\/\/wp.winter-weng.cc\/work\/index.php?rest_route=\/wp\/v2\/posts\/573\/revisions\/609"}],"wp:attachment":[{"href":"https:\/\/wp.winter-weng.cc\/work\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=573"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/wp.winter-weng.cc\/work\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=573"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/wp.winter-weng.cc\/work\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=573"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}