onkeyup事件

Question

javascriptjsfunction

Answer 1

function cc(val){
            if(/^[0-9]*$/.test(val)){
                if( val < 5 ){
                    alert("请输入大于5的数字");
document.getElementById("asd").value = 7;
                }
            }else{
                alert("请输入数字!");
            }
        }