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                            # Coroutine::exist
[TOC]
> 需要v4.3.0及以上

判斷指定協程是否存在

## API

~~~
function Coroutine::exist() : bool

~~~

## 例子

~~~
go(function () {
    go(function () {
        go(function () {
            Co::sleep(0.001);
            var_dump(Co::exists(Co::getPcid())); // 1: true
        });
        go(function () {
            Co::sleep(0.003);
            var_dump(Co::exists(Co::getPcid())); // 3: false
        });
        Co::sleep(0.002);
        var_dump(Co::exists(Co::getPcid())); // 2: false
    });
});
~~~
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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