Promise \u662f\u4e00\u4e2a Object, \u5b83\u6709\u4e24\u79cd\u5f62\u5f0f:<\/p>\n
1. Promise.resolve()
\n\u8fd9\u6837\u76f4\u63a5\u53ef\u4ee5\u7528.<\/p>\n
2.new Promise(function(resolved,rejected){ … resolved(param) … })
\n\u4e00\u4e2a Object \u7684\u5f62\u5f0f, \u91cc\u9762\u8981\u6709\u4e00\u4e2a function.<\/p>\n
\r\n\r\nvar count = 0;\r\nvar tick = () => {\r\n\tcount++;\r\n\tsetTimeout(() => {\r\n\t\tprocess.stdout.write('.');\r\n\t\tif(count < 100) tick();\r\n\t},100);\r\n}\r\ntick();\/\/Init\r\n\r\n\r\n\/\/Promise Syntax Tricks\r\nPromise.resolve()\r\n\t.then(() => {console.log('1')})\r\n\t.then(() => {\r\n\t\treturn new Promise( (resolved,rejected) =>\r\n\t\t\tsetTimeout(() => {\r\n\t\t\t\tconsole.log('2')\r\n\t\t\t\tresolved()\r\n\t\t\t},2000)\r\n\t\t);\r\n\t})\r\n\t.then(() => {console.log('3')})\r\n\t.then(() => {\r\n\t\treturn new Promise( (resolved,rejected) =>\r\n\t\t\tsetTimeout(() => {\r\n\t\t\t\tconsole.log('4')\r\n\t\t\t\tresolved()\r\n\t\t\t},4000)\r\n\t\t);\r\n\t})\r\n\t.then(() => {\r\n\t\t\/\/Block without promise\r\n\t\tsetTimeout(() => {\r\n\t\t\tconsole.log('5')\r\n\t\t},1000)\r\n\t})\r\n\t.then(() => {console.log('6')})\r\n\t.then(() => {console.log('7')})\r\n\t.then(() => {console.log('8')})\r\n\r\n\/\/Kinda messy, isn't it?\t\r\n\r\n<\/pre>\nOutput:<\/p>\n
\r\n\r\nnode index.js\r\n1\r\n...................2\r\n3\r\n........................................4\r\n6\r\n7\r\n8\r\n..........5\r\n...............................\r\n\r\n<\/pre>\n","protected":false},"excerpt":{"rendered":"