longpress.js
export default {
install(Vue, options = {
time: 2000
}) {
Vue.directive('longpress', {
bind: function (el, binding, vNode) {
// 确保提供的表达式是函数
if (typeof binding.value !== 'function') {
// 获取组件名称
const compName = vNode.context.name;
// 将警告传递给控制台
let warn = `[longpress:] provided expression '${binding.expression}' is not afunction, but has to be `;
if (compName) { warn += `Found in component '${compName}' ` }
console.warn(warn);
}
// 定义变量
let pressTimer = null;
// 定义函数处理程序
// 创建计时器( 1秒后执行函数 )
let start = (e) => {
if (e.type === 'click' && e.button !== 0) {
return;
}
if (pressTimer === null) {
pressTimer = setTimeout(() => {
// 执行函数
handler();
}, options.time)
}
}
// 取消计时器
let cancel = (e) => {
// 检查计时器是否有值
if (pressTimer !== null) {
clearTimeout(pressTimer);
pressTimer = null;
}
}
// 运行函数
const handler = (e) => {
// 执行传递给指令的方法
binding.value(e)
};
// 添加事件监听器
el.addEventListener("mousedown", start);
el.addEventListener("touchstart", start);
// 取消计时器
el.addEventListener("click", cancel);
el.addEventListener("mouseout", cancel);
el.addEventListener("touchend", cancel);
el.addEventListener("touchcancel", cancel);
}
})
}
}
在main.js中引入
import LongPress from './longpress.js'
Vue.use(LongPress, { time: 1000 })
//time:长按时长,可自行定义
组件或页面中使用
<div v-longpress="() => copyContent(item)"></div>
copyContent函数
copyContent(str) {
var input = document.createElement('input');
input.setAttribute('readonly', 'readonly'); // 防止手机上弹出软键盘
input.setAttribute('value', str);
document.body.appendChild(input);
input.select();
document.execCommand('copy');
document.body.removeChild(input);
}