console.log('script start')

const interval = setInterval(() => {
    console.log('setInterval')
}, 0)

setTimeout(() => {
    console.log('setTimeout 1')
    Promise.resolve().then(() => {
        console.log('promise 3')
    }).then(() => {
        console.log('promise 4')
    }).then(() => {
        setTimeout(() => {
            console.log('setTimeout 2')
            Promise.resolve().then(() => {
                console.log('promise 5')
            }).then(() => {
                console.log('promise 6')
            }).then(() => {
                clearInterval(interval)
            })
        }, 0)
    })
}, 0)

Promise.resolve().then(() => {
    console.log('promise 1')
}).then(() => {
    console.log('promise 2')
})

/// whole script tag as task,start exec
/// 
/// script start log
/// 
/// task queue: setInterval,setTimeout1
/// micro queue : [then1,then2]
/// 
/// start exec microqueue,执行完所有micro queue再执行下一次task queue
/// promise1 log
/// promise2 log
/// 
/// task queue: setInterval,setTimeout1
/// micro queue : []

/// 开始执行setInterval
/// setInterval log
/// 
/// task queue: setTimeout1,setInterval
/// micro queue : []

// micro queue 为空，继续下一轮task queue,执行setTimout1
// setTimout1 log
// 
/// task queue: setInterval
/// micro queue : [then3,then4,then45(第三个)]
/// 
/// 开始执行micro queue
/// promise3 log
/// promise 4 log
/// 将timeout push到taskqueue
/// 
/// task queue: setInterval,setTimeout2
/// micro queue : []

//开始执行task
//
//setInterval log
//

/// task queue: setTimeout2,setInterval
/// micro queue : []

// micro为空，继续执行task, timeout2出
// timeout2 log
// 将then5 then6 thenlast push到micro queue
// 
/// task queue: setInterval
/// micro queue : [then5 then6 thenlast]

//开始执行micro queue
//
// promise5 log
// promise6 log
// then last clearInterval
// 
/// task queue: []
/// micro queue : []

function isUSD(str) {
    var reg = /^\$\d{1,3}(,\d{3})*(\.\d{2})?$/
    return reg.test(str)
}

var str = 'x-x_';
var retArr = [];
str.replace(/(x_*)|(-)/g, function(match, p1, p2,pos1) {
    if (p1) { 
        retArr.push({ on: true, length: p1.length }); 
    }
    if (p2) { 
        retArr.push({ on: false, length: 1 }); 
    }
});
//替换的逻辑是 (或|) 左边->右边 ->左边->右边
// match x p1 x p2 undefined
// match - p1 undefined p2 -
// match x_ p1 x_ p2 undefined
// str = '';
// 

// [{
//     on : true,
//     length : 1
// },{ 
//     on: false, 
//     length: 1 
// },{
//     on : true,
//     length : 2
// }]
// 没有return 不会影响字符串
console.log(str);
console.log(retArr);