// 12345代表 a,ctrl-c,ctrl-x,ctrl-v,ctrl-a五个键的输入 function inputToNum(str) { const arr = str.split('') let res = '' let board = '' let selected = '' arr.forEach(x => { if(x == '1') { if(selected) { res = 'a' }else { res += 'a' } }else if(x == '2') { // 选择复制，将选中的内容添加到粘贴板 selected && (board = selected) }else if(x == '3') { // 选择剪切时，选择的内容清空，添加到粘贴板上 if(selected) { board = selected; selected = ''; res = ''; } }else if(x == '4') { // 进行粘贴时，选择的内容晴空，添加粘贴的内容 selected = '' res += board }else if(x == '5') { selected = res } }) return res.length }