从您的代码示例中，它看起来像Array.prototype.find，这就是您要查找的：Array.prototy.find（）和Array.prototype.findIndex（）

[1, 2, 3].find(function(el) {
    return el === 2;
}); // returns 2

在其他网站上找到此解决方案。您可以在try/catch场景中包装forEach。

if(typeof StopIteration == "undefined") {
 StopIteration = new Error("StopIteration");
}

try {
  [1,2,3].forEach(function(el){
    alert(el);
    if(el === 1) throw StopIteration;
  });
} catch(error) { if(error != StopIteration) throw error; }

此处提供更多详细信息：http://dean.edwards.name/weblog/2006/07/enum/

这不是最有效的，因为你仍然循环所有元素，但我认为这可能值得考虑非常简单的：

let keepGoing = true;
things.forEach( (thing) => {
  if (noMore) keepGoing = false;
  if (keepGoing) {
     // do things with thing
  }
});

使用array.prototype.every函数，它为您提供了中断循环的实用程序。请参阅Mozilla开发者网络上的Javascript文档示例

您可以创建forEach的变体，该变体允许break、continue、return甚至async/await：（用TypeScript编写的示例）

export type LoopControlOp = "break" | "continue" | ["return", any];
export type LoopFunc<T> = (value: T, index: number, array: T[])=>LoopControlOp;

Array.prototype.ForEach = function ForEach<T>(this: T[], func: LoopFunc<T>) {
    for (let i = 0; i < this.length; i++) {
        const controlOp = func(this[i], i, this);
        if (controlOp == "break") break;
        if (controlOp == "continue") continue;
        if (controlOp instanceof Array) return controlOp[1];
    }
};

// this variant lets you use async/await in the loop-func, with the loop "awaiting" for each entry
Array.prototype.ForEachAsync = async function ForEachAsync<T>(this: T[], func: LoopFunc<T>) {
    for (let i = 0; i < this.length; i++) {
        const controlOp = await func(this[i], i, this);
        if (controlOp == "break") break;
        if (controlOp == "continue") continue;
        if (controlOp instanceof Array) return controlOp[1];
    }
};

用法：

function GetCoffee() {
    const cancelReason = peopleOnStreet.ForEach((person, index)=> {
        if (index == 0) return "continue";
        if (person.type == "friend") return "break";
        if (person.type == "boss") return ["return", "nevermind"];
    });
    if (cancelReason) console.log("Coffee canceled because: " + cancelReason);
}

const Book = {"Titles":[                          
    {"Book3" : "BULLETIN 3"},
    {"Book1" : "BULLETIN 1"},
    {"Book2" : "BULLETIN 2"}    
]}

const findbystr = function(str) { 
    Book.Titles.forEach(function(data) { 
        if (typeof data[str] != 'undefined') {
            return data[str];
        } 
    }, str) 
}

book = findbystr('Book1');

console.log(book);