1.图片分为三种
on:half: off
<style> .star{ font-size: 0; } .star-item{ display: inline-block; background-repeat: no-repeat; width: 20px; height: 20px; margin-right: 22px; background-size: 100%; } .star-item.on{ background-image: url(img/on.png); } .star-item.half{ background-image: url(img/half.png); } .star-item.off{ background-image: url(img/off.png); } </style>
<div> <ul> <span v-for="(itemClass,index) in itemClasses" :class="itemClass" track-by="index"></span><!--性能优化 track-by 数据不改变时不会重新渲染--> </ul> </div>
<script> new Vue({ el: '#app', data:{ score: 4 }, computed:{ //计算属性 itemClasses(){ let result = []; let score = Math.floor(this.score * 2 ) / 2; let hasDecimal = score % 1 !== 0; let integer = Math.floor(score); for(let i=0;i<integer;i++){ result.push("on"); } if(hasDecimal){ result.push("half"); } while(result.length < 5){ result.push("off"); } return result; } } }) </script>
根据需求改变代码