油猴脚本加按钮 js

(function() {
        'use strict';
        let element = document.createElement('a');
        element.href = '#';
        element.textContent = '执行';
        element.style.position = 'fixed';
        element.style.right = '100px';
        element.style.color = 'red';
        element.style.top = '50%';
        element.style.transform = 'translateY(-50%)';
        element.style.border = '1px solid red';
        document.body.appendChild(element);
        element.addEventListener('click', ()=>{
            alert(123);
        });
    })();