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  • 19.JavaScript实现一定时长下点击次数

    JavaScript实现一定时长下点击次数

    <!DOCTYPE html>
    <html lang="en">
    
    <head>
        <meta charset="UTF-8">
        <meta name="viewport" content="width=device-width, initial-scale=1.0">
        <title>Document</title>
    </head>
    
    <body>
        <div class="time">
            倒计时:<span>60</span>
        </div>
        <div class="clickNum">
            点击次数:<span>0</span>
        </div>
        <button class="btnClick">点击</button>
        <button class="btnReset">重置</button>
        <script>
            var timer = null,//计时器id
                duration = 60,//倒计时时长
                frequency = 0;//点击次数
            var time = document.querySelector(".time span");
            var clickNum = document.querySelector(".clickNum span");
            var btnClick = document.querySelector(".btnClick");
            var btnReset = document.querySelector(".btnReset");
    
            btnClick.onclick = function () {
                if (frequency === 0) { //第一次点击开始计时
                    startTime();
                }
                if(duration === 0){//倒计时为0
                    return;
                }
                frequency++;
                clickNum.innerText = frequency;//记录点击次数
            }
    
            btnReset.onclick = function(){
                duration = 60;
                frequency = 0;
                clickNum.innerText = frequency;//点击次数重置为0
                time.innerText = duration;//倒计时长重置为60;
                clearInterval(timer);//清除计时器
                timer = null;
            }
    
            //开始计时
            function startTime() {
                if (timer) { //计时器有值,返回
                    return;
                }
                timer = setInterval(function () {
                    duration--;
                    time.innerText = duration;
    
                    if(duration === 0){
                        clearInterval(timer);
                        timer = null;
                    }
                }, 30);
            }
        </script>
    </body>
    
    </html>
    index.html

    效果展示:

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  • 原文地址:https://www.cnblogs.com/lanshanxiao/p/12800734.html
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