HarmonyOS应用开发-放大与缩小效果展现

Hml

<div class="container">
    <div class="box">
        <div style="width: {{ widthVal }};height: {{ heightVal }};
                flex-direction: row;
                justify-content: space-around;
                align-items: center;
                border: 2px;
                background-color: aquamarine;
                ">
            <button style="width: 80px;height: 30px;" onclick="enlarge">放大</button>
            <button style="width: 80px;height: 30px;" onclick="decrease">缩小</button>
        </div>
    </div>
</div>

Css

.container {
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 100%;
    height: 100%;
}
.box{
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 400px;
    height: 400px;
}

Js

import prompt from '@system.prompt';
let width = 200;
let height = 200;
export default {
    data: {
        widthVal:width,
        heightVal:height,
    },
    enlarge(){
        if (width < 400) {
            width +=10;
            height +=10;
            this.widthVal = width
            this.heightVal = height
        }else {
            prompt.showToast({message:"已经达到最大"})
        }
    },
    decrease(){
        if (width > 180) {
            width -=10;
            height -=10;
            this.widthVal = width
            this.heightVal = height
        }else{
            prompt.showToast({message:"不能再缩小了"})

        }
    },
}

效果展示：