BehaviorSubject
/*
ehaviorSubject接受一个默认参数，相当于new Subject后自动next('aa')
之后到行为和Subject一致
*/
const behave = new BehaviorSubject('aa');
behave.subscribe(res => {
console.log(res)
/*
ehaviorSubject接受一个默认参数，相当于new Subject后自动next('aa')
之后到行为和Subject一致
*/
const behave = new BehaviorSubject('aa');
behave.subscribe(res => {
console.log(res)
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