{"id":68474,"date":"2019-12-26T15:57:10","date_gmt":"2019-12-26T07:57:10","guid":{"rendered":"http:\/\/www.xiaoyebailong.com\/?p=68474"},"modified":"2019-12-26T15:57:12","modified_gmt":"2019-12-26T07:57:12","slug":"js%e4%bf%9d%e7%95%99%e4%b8%a4%e4%bd%8d%e5%b0%8f%e6%95%b0","status":"publish","type":"post","link":"http:\/\/www.xiaoyebailong.com\/index.php\/2019\/12\/26\/68474.htm","title":{"rendered":"js\u4fdd\u7559\u4e24\u4f4d\u5c0f\u6570"},"content":{"rendered":"\n<p><\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Math.<strong>floor<\/strong>()\uff0c\u4e0d\u56db\u820d\u4e94\u5165 \uff0c\u5411\u4e0b\u53d6\u6574<\/h4>\n\n\n\n<p>\u6ce8\u610f\uff0c\u4e0d\u6539\u53d8\u6570\u636e\u7c7b\u578b<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">\u4e0d\u56db\u820d\u4e94\u5165 \u5411\u4e0b\u53d6\u6574<br>num = Math.<strong>floor<\/strong>(num * 100) \/ 100;<br>console.log(num); \/\/2.44<br>console.log(typeof num); \/\/ number<\/pre>\n\n\n\n<p>\u4ee5\u4e0a\u4ee3\u7801\u4e0d\u597d\u7528\u4e0e\u9047\u89c170.79\u8fd9\u6837\u5c31\u53d8\u621070.8\u4e86<\/p>\n\n\n\n<p>\u6240\u4ee5\u81ea\u5df1\u5c31\u5199\u4e86\u4e00\u4e2a<\/p>\n\n\n\n<p>function twoplacess(num){<br> let numStr = num.toString();<br> let index = numStr.indexOf(&#8216;.&#8217;);<br> let result = numStr.slice(0, index + 3);<br> return result;<br> }<br> document.writeln(twoplacess(-70.739));<\/p>\n\n\n\n<p>\u8f93\u51fa-70.73<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Math.floor()\uff0c\u4e0d\u56db\u820d\u4e94\u5165 \uff0c\u5411\u4e0b\u53d6\u6574 \u6ce8\u610f\uff0c\u4e0d\u6539\u53d8\u6570\u636e\u7c7b\u578b \u4e0d\u56db\u820d\u4e94\u5165 \u5411\u4e0b\u53d6\u6574num = Math.floor(num * 100) \/ 100;console.log(num); \/\/2.44console.log(type&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4,8,1],"tags":[],"topic":[],"class_list":["post-68474","post","type-post","status-publish","format-standard","hentry","category-htmlcss","category-other","category-technology"],"_links":{"self":[{"href":"http:\/\/www.xiaoyebailong.com\/index.php\/wp-json\/wp\/v2\/posts\/68474","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.xiaoyebailong.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.xiaoyebailong.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.xiaoyebailong.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.xiaoyebailong.com\/index.php\/wp-json\/wp\/v2\/comments?post=68474"}],"version-history":[{"count":1,"href":"http:\/\/www.xiaoyebailong.com\/index.php\/wp-json\/wp\/v2\/posts\/68474\/revisions"}],"predecessor-version":[{"id":68475,"href":"http:\/\/www.xiaoyebailong.com\/index.php\/wp-json\/wp\/v2\/posts\/68474\/revisions\/68475"}],"wp:attachment":[{"href":"http:\/\/www.xiaoyebailong.com\/index.php\/wp-json\/wp\/v2\/media?parent=68474"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.xiaoyebailong.com\/index.php\/wp-json\/wp\/v2\/categories?post=68474"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.xiaoyebailong.com\/index.php\/wp-json\/wp\/v2\/tags?post=68474"},{"taxonomy":"topic","embeddable":true,"href":"http:\/\/www.xiaoyebailong.com\/index.php\/wp-json\/wp\/v2\/topic?post=68474"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}