Vue does a 30s countdown, which has a magnifying effect in the final 10s countdown.

topic description

vue does a 30s countdown and has a magnifying effect at the last 10s

sources of topics and their own ideas

related codes

/ / Please paste the code text below (do not replace the code with pictures)
< template > 

{{second}}

< / div >

< / template >

< script >
export default {

data () {
  return {
    seconds: 30
  }
},
mounted () {
  this.add()
},
methods: {
  num: function (n) {
    return n < 10 ? "0" + n : "" + n
  },
  add: function () {
    var _this = this
    var time = window.setInterval(function () {
      if (_this.seconds === 0 ) {
        _this.seconds = 0
      } else if ( _this.seconds === 0) {
        _this.seconds = 0
        window.clearInterval(time)
      } else {
        _this.seconds -= 1
      }
    }, 1000)
  }
},
computed: {
  second: function () {
    return this.num(this.seconds)
  },
}

}
< / script >

what result do you expect? What is the error message actually seen?

I hope the Great God will give me a method

Html5 css
Sep.16,2021

html 

<p :class="{ zoom: isZoom }">{{second}}

js 

data () {
    return {
        seconds: 30,
        isZoom: false
    }
},

methods: {
    num: function (n) {
        this.isZoom = n <= 10 && n > 0;
        return n < 10 ? '0' + n : '' + n
    },
    ...
}

css 

.zoom {
    animation: test 1s infinite;
}
@keyframes test {
    from {
        font-size: 14px;
    }
    to {
        font-size: 24px;
    }
}
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8"/>
    <title>Title</title>
    <style>
        * {
            margin: 0;
            padding: 0;
        }
        -sharpapp {
            text-align: center;
            padding: 100px;
        }
        -sharpapp p {
            font-size: 16px;
            transition: all 1s ease;
        }
        -sharpapp p.large {
            animation: changeSize 1s infinite;
            -webkit-animation: changeSize 1s infinite; /* Safari  Chrome */
        }
        -sharpapp p.zero {
            font-size: 22px;
        }
        @keyframes changeSize {
            0% {
                font-size: 16px;
            }
            50% {
                font-size: 22px;
            }
            100% {
                font-size: 16px;
            }
        }
        @-webkit-keyframes changeSize {
            0% {
                font-size: 16px;
            }
            50% {
                font-size: 22px;
            }
            100% {
                font-size: 16px;
            }
        }
    </style>
</head>
<body>
    <div id="app">
        <p :class="[second < 10 && second > 0 ? 'large' : '', second == 0 ? 'zero' : '']">{{second < 10 ? '0' + second : second}}

    </div>
    <script src="https://cdn.bootcss.com/vue/2.5.17-beta.0/vue.min.js"></script>
    <script>
        new Vue({
            el: '-sharpapp',
            data() {
                return {
                    second: 15,
                    timer: null
                }
            },
            methods:{
                setTimer() {
                    this.timer = window.setInterval(() => {
                        if(this.second <= 0) {
                            window.clearInterval(this.timer)
                            return false;
                        }
                        this.second--;
                    }, 1000)
                }
            },
            mounted() {
                this.setTimer();
            },
            beforeDestroy() {
                if(this.timer){
                    window.clearInterval(this.timer)
                }
            },
        })

        
    </script>
</body>
</html>

Previous: Vscode in the selected input box will show a white border is so ugly, how to hide

Next: About the mobile rem custom dots.

css mysql arrays josn react html typescript webpack npm sass R objective-c .net sql-server jquery python-3.x angularjs django angular excel regex iphone ajax linux xml pandas vba spring database wordpress string wpf xcode windows bash postgresql oracle multithreading eclipse list firebase algorithm macos forms image scala visual-studio azure bootstrap spring-boot react-native python-2.7 docker performance function winforms matlab powershell apache dataframe api sqlite numpy rest shell selenium flutter dart maven loops qt swing android-studio csv express file class tensorflow sorting codeigniter perl
MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b3705d-2c075.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b3705d-2c075.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
Need Help?