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function map(f, a) { const result = new Array(a.length); for (let i = 0; i < a.length; i++) { result[i] = f(a[i]); } return result; } 在以下代码中,该函数接收由函数表达式定义的函数,并对作为第二个参数接收的数组的每个元素执行该函数: jsCopy to Clipboard function map(f,...
console.log(ary2.next());//Object {value: Array[2], done: false} value:Array[2] ---[0:1,1:2]; //可以看出每次执行这个next().都会返回一个该数组的索引和值组成的新的数组,被包在一个对象的value属性里 //所以可以通过ary2.next().value获取当前的值和索引 3...
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与其他语言相比,函数的 this 关键字在 JavaScript 中的表现略有不同,此外,在严格模式和非严格模式之间也会有一些差别。
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array Array The JavaScriptArrayclass is a global object that is used in the construction of arrays; which are high-level, list-like objects. Description Arrays are list-like objects whose prototype has methods to pe...
array 调用了 some() 的数组本身。 thisArg 可选 执行callbackFn 时用作 this 的值。参见迭代方法。返回值 如果回调函数对数组中至少一个元素返回一个真值,则返回 true。否则返回 false。 描述 some() 方法是一个迭代方法。它为数组中的每个元素调用一次指定的 callbackFn 函数,直到 callbackFn 返回一个真值。
info(array); // ["a", "b", 0, 1, 2] 使用apply() 和内置函数 巧妙地使用 apply() 可以让你在某些情况下使用内置函数来完成一些任务,而这些任务通常需要手动遍历集合(或使用展开语法)。 例如,我们可以使用 Math.max() 和Math.min() 来找出数组中的最大值和最小值。 jsCopy to Clipboard // ...