new Promise(function (resolve) {
console.log('4')
resolve()
}).then(function () {
console.log('6')
})
new Promise(function (resolve) {
console.log('4')
resolve()
}).then(function () {
console.log('6')
})
new Promise(function (resolve) {
console.log('4')
resolve()
}).then(function () {
console.log('6')
})
new Promise(function (resolve) {
console.log('4')
resolve()
}).then(function () {
console.log('6')
})
面试被问到的问题：我们都知道then会加到微任务队列，像上面这种情况，如果我有1万个new Promise，那微任务队列会不会爆满影响浏览器性能？怎么解决？
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