// promise的第一版實現
function
mypromise(constructor)
}function
reject(reason)
}//捕獲構造異常
try catch (e)
}mypromise.prototype.then = function (onfullfilled, onrejected)
}var
p = new
mypromise(function (resolve, reject) );
p.then(function (x) ) //輸出1
// mypromise 無法執行非同步的resolve
varp = new
mypromise(function (resolve, reject) , 1000)
});p.then(function (x) ) //無輸出
// 2, 基於觀察者
function
mypromise(constructor) );}}
function
reject(reason) )}}
//捕獲構造異常
try catch (e)
}mypromise.prototype.then = function (onfullfilled, onrejected) );
self.onrejectedarray.push(function () );
break;
case
"resolved":
onfullfilled(self.value);
break;
case
"rejected":
onrejected(self.reason);
break; default:}}
varp = new
mypromise(function (resolve, reject) , 1000)
});p.then(function (x) ) //無輸出
// 3.v3.0then方法實現鏈式呼叫
mypromise.prototype.then = function (onfullfilled, onrejected)
catch (e)
});self.onrejectedarray.push(function () catch (e)
});})
break;
case
"resolved":
promise2 = new
mypromise(function (resolve, reject) catch (e)
})break;
case
"rejected":
promise2 = new
mypromise(function (resolve, reject) catch (e)
})break;
default:
}return
promise2;
}var
p = new
mypromise(function (resolve, reject) , 1000)
});p.then(function (x) ) //輸出 1 鏈式呼叫1 鏈式呼叫2
// 4.v4.0 then函式中的onfullfilled和onrejected方法的返回值問題
function
resolvepromise(promise, x, resolve, reject)
letisused;
if (x !== null && (typeof
x === "object" || typeof
x === "function")) , function (e) )
} else
} catch (e)
} else
}mypromise.prototype.then = function (onfullfilled, onrejected) catch (e)
})});
self.onrejectedarray.push(function () catch (e)
})});
})case
"resolved":
promise2 = new
mypromise(function (resolve, reject) catch (e)
})})
break;
case
"rejected":
promise2 = new
mypromise(function (resolve, reject) catch (e)
})})
break;
default:
}return
promise2;
}
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