js实现卡号每四位空格分隔

Posted 2020-10-17 Flying bird

window.onload =function() {
        document.getElementById("input_num").oninput =function() {
            this.value =this.value.replace(/\s/g,‘‘).replace(/\D/g,‘‘).replace(/(\d{4})(?=\d)/g,"$1 ");;
        };
    };