{"id":2891,"date":"2017-10-19T16:01:45","date_gmt":"2017-10-19T08:01:45","guid":{"rendered":"http:\/\/www.daliane.com\/?p=2891"},"modified":"2017-10-19T16:01:49","modified_gmt":"2017-10-19T08:01:49","slug":"js_qiao_yong_yu","status":"publish","type":"post","link":"http:\/\/www.daliane.com\/category\/jinjiaoyou\/js_qiao_yong_yu\/","title":{"rendered":"JS \u5de7\u7528 && \u4e0e ||"},"content":{"rendered":"

\n\t\u5728\u5bf9\u4e8e\u6d41\u7a0b\u63a7\u5236\u8bed\u53e5\u5f53\u4e2d\uff0c\u6211\u4eec\u6700\u719f\u6089\u4e0d\u8fc7\u7684\u5c31\u662f\n<\/p>\n

\n
1<\/span> if<\/span> (\u6761\u4ef6){ <\/span>2<\/span> \/\/<\/span>\u4ee3\u7801\u5757 <\/span> 3<\/span> }else<\/span>{ <\/span>4<\/span> \/\/<\/span>\u4ee3\u7801\u5757<\/span> 5<\/span> }<\/pre>\n<\/div>\n
\n\t\u5bf9\u4e8e\u4e00\u4e2a\u6267\u884c\u4e0d\u540c\u7684\u4ee3\u7801\u6765\u8bf4\uff0c\u5982\u679c\u6267\u884c\u7684\u4ee3\u7801\u5f88\u591a\uff0c\u53ef\u80fd\u5c31\u6709\u5fc5\u8981\u4f7f\u7528\u4e0a\u9762\u8fd9\u79cd\u65b9\u5f0f\n<\/p>\n
\n\t\u4f46\u5f80\u5f80\u6211\u4eec\u5f00\u53d1\u5f53\u4e2d\uff0c\u4e5f\u4f1a\u78b0\u5230\u4e00\u4e9b\u8d4b\u503c\u64cd\u4f5c\uff0c\u5982\u679c\u4f7f\u7528\u4e0a\u9762\u65b9\u5f0f\uff0c\u672a\u514d\u663e\u5f97\u592a\u8fc7\u5197\u4f59\u3002\n<\/p>\n
\n\t\u4e3e\u4e2a\u4f8b\u5b50\uff1a\n<\/p>\n
\n
\n\t\t\"\u590d\u5236\u4ee3\u7801\"<\/a><\/span>\n\t<\/div>\n
var<\/span> num1 = 10; <\/span>var<\/span> num2 = 20; <\/span>\/\/<\/span> \u5047\u5982 num2 > num1 \u5c31 alert( num2 ) \u5426\u5219 alert( num1 )\r\n\/\/ \u53ef\u80fd\u89c1\u5230\u7684\u5199\u6cd5\u4f1a\u6709\u4ee5\u4e0b\u65b9\u5f0f\r\nif( num2 > num1 ){\r\n  alert( num2 );\r\n}else{\r\n\u3000 alert( num1 );\r\n} <\/span><\/pre>\n
\n\t\t\"\u590d\u5236\u4ee3\u7801\"<\/a><\/span>\n\t<\/div>\n<\/div>\n
\n\t\u53ef\u4ee5\u770b\u89c1\u4ee5\u4e0a\u65b9\u5f0f\uff0c\u53ea\u662f\u8f93\u51fa\u4e00\u4e2a\u7ed3\u679c,\u5374\u7528\u4e86\u4e94\u884c\u4ee3\u7801\u6765\u53bb\u5b9e\u73b0\u3002\n<\/p>\n
\n\t\u63a5\u4e0b\u6765\uff0c\u6211\u4eec\u89c1\u8bc1\u4e0b\u600e\u4e48\u4f7f\u7528\u4e00\u884c\u4ee3\u7801\u53bb\u66ff\u4ee3\u4e0a\u9762\u4e94\u884c\u4ee3\u7801\u5b9e\u73b0\u7684\u7ed3\u679c\n<\/p>\n
\n
\n\t\t\"\u590d\u5236\u4ee3\u7801\"<\/a><\/span>\n\t<\/div>\n
1<\/span> var<\/span> num1 = 10\uff1b <\/span>2<\/span> var<\/span> num2 = 20; <\/span>3<\/span> 4<\/span> \/\/<\/span> \u7b2c\u4e00\u79cd\u65b9\u5f0f \u4e5f\u53ef\u4ee5\u4f7f\u7528 \u4e09\u76ee\u8fd0\u7b97\u7b26<\/span> 5<\/span> alert( num2 > mum1 ? num2 : num1 ); <\/span>6<\/span> 7<\/span> \/\/<\/span>\u7b2c\u4e8c\u79cd\u65b9\u5f0f  \u5c31\u662f\u4f7f\u7528 && \uff0c||<\/span> 8<\/span> alert( num2 > num1 && num2 || num1 ); <\/pre>\n
\n\t\t\"\u590d\u5236\u4ee3\u7801\"<\/a><\/span>\n\t<\/div>\n<\/div>\n
\n\t \n<\/p>\n
\n\t\u4f7f\u7528 &&,|| \u6bd4\u4e09\u76ee\u8fd0\u7b97\u7684\u4f18\u52bf\u5728\u4e8e\uff0c\u5b83\u53ef\u4ee5\u5224\u65ad\u591a\u4e2a\u6761\u4ef6\uff0c\u4e5f\u53ef\u4ee5\u5355\u72ec\u4f7f\u7528\n<\/p>\n
\n\t\u4e3e\u4e2a && \u4f8b\u5b50\uff1a\n<\/p>\n
\n
\n\t\t\"\u590d\u5236\u4ee3\u7801\"<\/a><\/span>\n\t<\/div>\n
var<\/span> num1 = 10; <\/span>var<\/span> num2 = 5; <\/span>\/\/<\/span> \u5047\u5982 num1,num2 \u90fd\u5927\u4e8e10 \u5219\u8f93\u51fa num1+num2;<\/span> var<\/span> result = num1>10 && num2 >10 && num1+ num2 || 0;\r\n       alert(result);<\/span><\/pre>\n
\n\t\t\"\u590d\u5236\u4ee3\u7801\"<\/a><\/span>\n\t<\/div>\n<\/div>\n
\n\t\u6211\u4eec\u5f00\u53d1\u77e5\u9053\uff0c\u5728\u5f00\u53d1\u5f53\u4e2d\uff0c\u8bfb\u53d6\u540e\u7aef\u8fd4\u56de\u7684\u6570\u636e\u53ef\u80fd\u56e0\u67d0\u79cd\u539f\u56e0\u800c\u672a\u8bfb\u53d6\u5230\uff0c\u90a3\u4e48\u63a5\u6536\u7684\u6570\u636e\u5982\u679c\u662f\u5bf9\u8c61\uff0c\u90fd\u4f1a\u5728\u63a5\u6536\u8be5\u5b57\u6bb5\u7684\u65f6\u5019\u989d\u5916\u52a0\u4e0a\u6ca1\u6709\u83b7\u53d6\u5230\u65f6\u7684\u5b57\u6bb5\n<\/p>\n
\n\t\u4e3e\u4e2a || \u4f8b\u5b50\uff1a\n<\/p>\n
\n
var<\/span> reuslt = res && res.data || []; <\/span>if<\/span> ( result.length ) return<\/span>;<\/pre>\n<\/div>\n
\n\t\u4f7f\u7528\u8fd9\u79cd\u65b9\u5f0f\uff0c\u53ef\u4ee5\u901a\u8fc7\u6761\u4ef6\u5224\u65ad\u662f\u5426\u4f7f\u7528\u8be5\u53d8\u91cf\uff0c\u5047\u5982\u662f\u5bf9\u8c61\uff0c\u5982\u679c\u6ca1\u6709\u83b7\u53d6\u5230\uff0c\u800c\u4f7f\u7528\u8be5\u5bf9\u8c61\u5c5e\u6027\uff0c\u5219\u4f1a\u62a5\u9519\u3002\n<\/p>\n
\n\t\u800c\u907f\u514d\u8fd9\u79cd\u6a21\u5f0f\uff0c\u5c31\u662f\u5728\u4f7f\u7528\u7684\u65f6\u5019\uff0c\u4e00\u5b9a\u8981\u5224\u65ad\uff0c\u5224\u65ad\uff0c\u5224\u65ad<\/p>\n","protected":false},"excerpt":{"rendered":"
\u5728\u5bf9\u4e8e\u6d41\u7a0b\u63a7\u5236\u8bed\u53e5\u5f53\u4e2d\uff0c\u6211\u4eec\u6700\u719f\u6089\u4e0d\u8fc7\u7684\u5c31\u662f 1 if (\u6761\u4ef6){ 2 \/\/\u4ee3\u7801\u5757 3 }else{ 4 \/\/…<\/p>\n","protected":false},"author":2,"featured_media":228,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_kad_post_transparent":"","_kad_post_title":"","_kad_post_layout":"","_kad_post_sidebar_id":"","_kad_post_content_style":"","_kad_post_vertical_padding":"","_kad_post_feature":"","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"footnotes":""},"categories":[60],"tags":[233],"_links":{"self":[{"href":"http:\/\/www.daliane.com\/category\/jinjiaoyou\/wp-json\/wp\/v2\/posts\/2891"}],"collection":[{"href":"http:\/\/www.daliane.com\/category\/jinjiaoyou\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.daliane.com\/category\/jinjiaoyou\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.daliane.com\/category\/jinjiaoyou\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"http:\/\/www.daliane.com\/category\/jinjiaoyou\/wp-json\/wp\/v2\/comments?post=2891"}],"version-history":[{"count":1,"href":"http:\/\/www.daliane.com\/category\/jinjiaoyou\/wp-json\/wp\/v2\/posts\/2891\/revisions"}],"predecessor-version":[{"id":2893,"href":"http:\/\/www.daliane.com\/category\/jinjiaoyou\/wp-json\/wp\/v2\/posts\/2891\/revisions\/2893"}],"wp:featuredmedia":[{"embeddable":true,"href":"http:\/\/www.daliane.com\/category\/jinjiaoyou\/wp-json\/wp\/v2\/media\/228"}],"wp:attachment":[{"href":"http:\/\/www.daliane.com\/category\/jinjiaoyou\/wp-json\/wp\/v2\/media?parent=2891"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.daliane.com\/category\/jinjiaoyou\/wp-json\/wp\/v2\/categories?post=2891"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.daliane.com\/category\/jinjiaoyou\/wp-json\/wp\/v2\/tags?post=2891"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}