~~~ // for (let i = 0; i <= 5; i++) { // setTimeout(function () { // console.log(i); // }, 1000); // } ~~~ 打印6，过1秒连续打印012345  ~~~ // for (var i = 0; i <= 5; i++) { // ~function (i) { // setTimeout(function () { // console.log(i); // }, 1000); // }(i); // } ~~~ 打印-1，过1秒连续打印012345  ~~~ // for (var i = 0; i <= 5; i++) { // setTimeout(function (i) { // return function () { // console.log(i); // } // }(i), 1000); // } ~~~ 打印6，过1秒连续打印012345  ~~~ // for (var i = 0; i <= 5; i++) { // setTimeout((i => () => console.log(i))(i), 1000); // } ~~~ 打印6，过1秒连续打印012345  ~~~ // for (var i = 0; i <= 5; i++) { // setTimeout(function (i) { // console.log(i); // }.bind(null, i), 1000); // } //... ~~~ 打印6，过1秒连续打印012345  ~~~ for(var i=0;i<5;i++){ setTimeout(function () { console.log(new Date(),i);//5,5,5,5,5 },1000); } console.log(new Date(),i); //直接输出5，过一秒后输出5个5 for(var i=0;i<5;i++){ setTimeout(() => { console.log(new Date(),i);//5,5,5,5,5 },1000); } console.log(new Date(),i); //直接输出5，过一秒后输出5个5 for(var i=0;i<5;i++){ (function (j) { setTimeout(function () { console.log(new Date(),j); },1000); })(i); } console.log(new Date(),i); //开始输出5，过一秒后直接输出0,1,2,3,4 var output = function (i) { setTimeout(function () { console.log(new Date(),i); },1000); }; for(var i=0;i<5;i++){ output(i); } console.log(new Date(),i) //开始输出5，过一秒后直接输出0,1,2,3,4 for(let i=0;i<5;i++){ setTimeout(function () { console.log(new Date(),i); },1000); } console.log(new Date(),i); //开始输出5，过一秒后直接输出0,1,2,3,4 for(var i=0;i<5;i++){ (function (j) { setTimeout(function () { console.log(new Date(),j); },1000*j); })(i); } //每隔一秒输出0,1,2,3,4 setTimeout(function () { console.log(new Date(),i); },1000*i); //隔5秒输出5 const tasks = []; for(var i=0;i<5;i++){ ((j)=>{ tasks.push(new Promise((resolve)=>{ setTimeout(()=>{ console.log(new Date(),j); resolve(); },1000*j); })); })(i); } //每隔一秒输出0,1,2,3,4 Promise.all(tasks).then(()=>{ setTimeout(()=>{ console.log(new Date(),i); },1000) }); //隔5秒输出5 const tasks = []; const output = (i) => new Promise((resolve)=>{ setTimeout(()=>{ console.log(new Date(),i); resolve(); },1000*i); }); for(var i=0;i<5;i++){ tasks.push(output(i)); } //每隔一秒输出0,1,2,3,4 Promise.all(tasks).then(()=>{ setTimeout(()=>{ console.log(new Date(),i); },1000) }); //隔5秒输出5 //ES7 const sleep = (timeountMS)=> new Promise((resolve)=>{ setTimeout(resolve,timeountMS); }); (async()=>{ for(var i=0;i<5;i++){ await sleep(1000); console.log(new Date(),i); } await sleep(1000); console.log(new Date(),i); })(); //每隔一秒输出0,1,2,3,4,5 ~~~