Vue自定义加水波纹效果指令实例代码

 <div class="app">
        <h1>{{title}}</h1>
        <button v-shuibowen="">点我发散水波纹</button>
        <!-- <div class="box" v-shuibowen=""></div> -->
    </div>

 const vm = new Vue({
            data: {
                title: "自定义指定设置水波纹"
            }
        }).$mount(".app")

 Vue.directive('shuibowen', {
                        //binding 指令携带的变量数据
            inserted: function(el, binding) {
                el.addEventListener('click', function(e) {
                    let x = e.clientX - el.offsetLeft
                    let y = e.clientY - el.offsetTop

                    //在鼠标位置增加一个span标签
                    let span = document.createElement("span")
                    span.style.position = "absolute"
                    span.style.background = binding.value || 'rgba(150, 91, 91, .5)'
                    span.style.opacity = 1;
                    span.style.borderRadius = '50%'
                    el.append(span)
                    let width = 0
                    let height = 0
                    let opacity = 1
                    let max_length = Math.sqrt(el.offsetWidth * el.offsetWidth + el.offsetHeight * el.offsetHeight) * 2

                    let time = setInterval(() => {
                        width += 5
                        height += 5
                        opacity -= 0.01
                        //判断超出最大值时，清除定时，并且删除span
                        if (width < max_length) {
                            span.style.width = width + 'px'
                            span.style.height = height + 'px'
                            span.style.opacity = opacity;
                            span.style.left = x - span.offsetWidth / 2 + 'px'
                            span.style.top = y - span.offsetHeight / 2 + 'px'
                        } else {
                            clearInterval(time)
                            time = null;
                            span.remove()
                        }
                    }, 10)
                })

            }
        })