test2- [x] - [x] - [ ] - [ ] - [ ] ** ==++要完全理解异步，就需要了解 JS 的

- [x] - [x] - [ ] - [ ] - [ ] ** ==++要完全理解异步，就需要了解 JS 的运行核心——事件循环（event loop）。**

gantt
dateFormat YYYY-MM-DD
section S1
T1: 2014-01-01, 9d
section S2
T2: 2014-01-11, 9d
section S3
T3: 2014-01-02, 9d

gantt
dateFormat YYYY-MM-DD
section S1
T1: 2014-01-01, 9d
section S2
T2: 2014-01-11, 9d
section S3
T3: 2014-01-02, 9d

link

44
44
44 4.44

for(var i = 0; i < 3; i++) {
   setTimeout(function() {
       console.log('timeout' + i);
   })
}
<html>


<html>
for(var i = 0; i < 3; i++) {
   setTimeout(function() {
       console.log('timeout' + i);
   })
}

new Promise(function(resolve) {
    console.log('promise1');
    for(var i = 0; i < 1000; i++) {
        i == 99 && resolve();
    }
    console.log('promise2');
}).then(function() {
    console.log('then1');
})

console.log('global1');->




for(var i = 0; i < 3; i++) {
   setTimeout(function() {
       console.log('timeout' + i);
   })
}

new Promise(function(resolve) {
    console.log('promise1');
    for(var i = 0; i < 1000; i++) {
        i == 99 && resolve();
    }
    console.log('promise2');
}).then(function() {
    console.log('then1');
```math
E = mc^2

})

console.log('global1');