执行后不从订阅服务器返回真值，它总是返回默认值false

Question

当preillloginid正在执行时，我总是得到false(默认值)，即使订阅中的每个代码都在执行。请帮助我返回True值。

private prefillLoginId(currentLoginId: any, cms: any) 
{
let status =false;
let patterns = [];            
this.subSink.sink = cms.subscribe(content => {           

patterns = !!content['ClientSideValidations']['LoginId'] ? content['ClientSideValidations']['LoginId'] : [''];          
status = this.patternCheckStatus(patterns, currentLoginId);;
});           
return status;
}
private patternCheckStatus(patterns:any,currentLoginId)
{
let patternCheckStatus = false;
let regex: RegExp;
patterns.forEach(x => {
regex = new RegExp(x);   
if (regex.test(currentLoginId)) {                              
patternCheckStatus = true;
}
});


return patternCheckStatus;
}

Answer 1

这是因为这里的异步操作。subscribe中的代码在从方法返回状态后执行，并且当它返回其值为false时执行。你应该改变你的方法，像下面这样返回observable:-

private prefillLoginId(currentLoginId: any, cms: any) 
{
let status =false;
let patterns = [];            
return cms.pipe(map(content => {           

patterns = !!content['ClientSideValidations']['LoginId'] ? content['ClientSideValidations']['LoginId'] : [''];          
status = this.patternCheckStatus(patterns, currentLoginId);;
return status;
}));           
}

，无论你在哪里调用这个方法，使用它像:-

prefillLoginId.subscribe((status) => console.log(status));