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This article mainly explains "JavaScript how to achieve a simple lottery system", the content of the article is simple and clear, easy to learn and understand, the following please follow the editor's ideas slowly in depth, together to study and learn "JavaScript how to achieve a simple lucky draw system" bar!

Simulation realization of lottery system

The front end uses JavaScript code to implement the lottery system. The code is as follows:

Style Code:

Body {background: url ("bg.jpg") no-repeat; background-size: 100%;} # box {position: absolute; left: 50%; top: 50%; margin:-250px 00-250px; text-align: center; line-height: 100px; font-size: 40px Width: 500px; height: 300px; background: rgba; border-radius: 10px; box-shadow: 8px 8px 15px rgba;} # start {margin: 0; height: 50px; width: 120px; font-size: 30px Color: darkred; opacity: 0.6; box-shadow: 3px 3px 3px # f00;} # winner {border-radius: 5px; background: pink; margin-left: 100px; margin-right: 100px; opacity: 0.5;}

Body code

Lucky draw var names = ["Jack horse", "sesame vine", "brother giao", "medicine sauce", "pot", "quail", "big Sima"]; function extrust () {var index = parseInt (Math.random () * names.length); names.splice (index,1) / / remove the winner document.getElementById ('winner'). InnerText = names [index];} let start = false; var flag;// scheduled task tag document.getElementById ("start"). AddEventListener (' click',function () {if (names.length = = 0) {document.getElementById ('winner'). InnerText = "draw over" Return;} if (start) {/ / clear the scheduled task clearInterval (flag) for the specified tag; extrust () } else {flag = setInterval (function () {document.getElementById ('winner'). InnerText = names [parseInt (Math.random () * names.length)];}, 20)} / / status reverse start =! start;})

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