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Today, I will talk to you about the iterative methods of JavaScript, which may not be well understood by many people. in order to make you understand better, the editor has summarized the following content for you. I hope you can get something according to this article.

1. Every if the function returns true for each item, it returns true.

2. Filter returns the function returns an array of items of true.

3. The forEach method does not return a value.

4. Map returns an array of results of each function call.

Example

Var numbers = [1Jing 2, index, array) {return (item > 2)]; var everyResult = numbers.every (function (item, index, array) {return (item > 2)}); alert (everyResult); / / false var someResult = numbers.some (function (item, index, array) {return (item > 2);}); alert (someResult); / / true var numbers = [1, 2, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1] Var filterResult = numbers.filter (function (item, index, array) {return (item > 2);}); alert (filterResult); / / [3, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 5, 4, 4, 5, 4, 5, 4, 5, 4, 5, 5, 5, 4, 5, 5, 4, 5, 4, 5, 4, 5, 4, 5, 4, 5, 4, 5, 4, 5, 4, 4, 4, 5, 4, 4, 4, 5, 4, 4, 4, 5, 4, 4, 6, 4, 5, 4, 4, 5, 4, 4, 4, 5, 4, 4, 5, 4, 4, 5, 4, 4, 4, 5, 4, 4, 4, 5, 4, 4, 5, 4, 5, 4, 5, 5, 4, 5, 4, 5, 5, 4, 5, 4, 5, 4, 5, 4, 5, 4, 5, 4, 4 Numbers.forEach (function (item, index, array) {/ / perform some operations}); after reading the above, do you have any further understanding of the JavaScript iterative method? If you want to know more knowledge or related content, please follow the industry information channel, thank you for your support.

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