javascript Javascript从同一函数内部调用函数
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Javascript calling function from inside same function
提问by Egidi
I have a function that does several DDBB calls, so it is asynchronous.
我有一个执行多个 DDBB 调用的函数，因此它是异步的。
I need to call the function and check a data value (winner) in the JSON object it returns. If it is true i need to call the function again until winner == false.
我需要调用该函数并检查它返回的 JSON 对象中的数据值（获胜者）。如果是真的，我需要再次调用该函数，直到获胜者 == 假。
I can't use while because it is not asynchronous, how can i do this?
我不能使用 while 因为它不是异步的，我该怎么做？
someFunction(function(result) {
// if result.winner == true repeat
})
回答by dfsq
You can call the same callback function again until condition is true:
您可以再次调用相同的回调函数，直到条件为true：
someFunction(function repeat(result) {
if (result.winner) {
someFunction(repeat);
}
});
Check the demo below.
检查下面的演示。
someFunction(function repeat(result) {
document.body.innerHTML += '<br>' + result.winner;
if (result.winner) {
someFunction(repeat);
}
});
var results = [true, true, true, false];
function someFunction(callback) {
setTimeout(function() {
callback({winner: results.shift()});
}, (Math.random() + 1) * 1000 | 0);
}回答by YuraA
Have you looked at async.js? It has several control flow async functions. You probably want to look into whilst, doWhilst, until, doUntil:
你看过 async.js 吗？它有几个控制流异步功能。您可能想查看 while、doWhilst、until、doUntil：
https://github.com/caolan/async#whilst
https://github.com/caolan/async#whilst
whilst(test, fn, callback)
Repeatedly call fn, while test returns true. Calls callback when stopped, or an error occurs.
反复调用 fn，而 test 返回 true。停止或发生错误时调用回调。
