Shulou(Shulou.com)06/03 Report--

This article mainly introduces "what is the meaning of the three dots in JavaScript". In the daily operation, I believe that many people have doubts about the meaning of the three dots in JavaScript. The editor consulted all kinds of materials and sorted out a simple and easy-to-use method of operation. I hope it will be helpful to answer the doubts of "what is the meaning of the three dots in JavaScript?" Next, please follow the editor to study!

1. The real name of the three dots (...) is the extension operator, which is a new addition in ES6.

2. You can expand the array expression or string at the syntax level when the function call / array is constructed.

You can also expand object expressions as key-value when constructing literal objects

The literal quantity generally refers to the concise construction of [1 name:'chuichui' 2] or {3}, and the multi-layer nested array and the three points of objects are powerless.

/ / Array var number = [1 name:'chuichui',height:176 2 console.log 3 4 5 5 5] console.log (... console.log) / / 1 2 3 4 56 6 / object var man = {name:'chuichui',height:176} console.log ({... man}) / {name:'chuichui',height:176}

Replication usage

/ / replication of the array var arr1 = ['hello'] var arr2 = [... arr1] arr2 / / [' hello'] / / object copy var obj1 = {name:'chuichui'} var obj2 = {... arr} ob12 / / {name:'chuichui'}, the study on "what is the meaning of the three periods in JavaScript" is over, hoping to solve everyone's doubts. The collocation of theory and practice can better help you learn, go and try it! If you want to continue to learn more related knowledge, please continue to follow the website, the editor will continue to work hard to bring you more practical articles!

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.