我正在尝试编写电话输入屏蔽功能。在这里:
let input = document.querySelector('input');
input.addEventListener('input', ()=>{
let x = event.target.value.replace(/\D/g, '').match(/(\d{0,1})(\d{0,3})(\d{0,3})(\d{0,2})(\d{0,2})/);
event.target.value = !x[2] ? x[1] : '+' + x[1] + ' (' + x[2] + ') ' + x[3] + (x[4] ? '-' + x[4] : '') + (x[5] ? '-' + x[5] : '');
})
<input />
它有效,但是有一个问题。当我按退格键时,我会将电话号码擦除为+1(111)。这样的条目对正则表达式有效,并且字符串被其自身替换
答案 0 :(得分:0)
按照@ggorlen在评论中的建议,这是一种实现方法:
let input = document.querySelector('input');
input.addEventListener('keydown', (event)=>{
if (event.key === "Backspace" || event.key === "Delete") return;
let x = event.target.value.replace(/\D/g, '').match(/(\d{0,1})(\d{0,3})(\d{0,3})(\d{0,2})(\d{0,2})/);
event.target.value = !x[2] ? x[1] : '+' + x[1] + ' (' + x[2] + ') ' + x[3] + (x[4] ? '-' + x[4] : '') + (x[5] ? '-' + x[5] : '');
})
<input maxlength=18 />