function validation() {
var val = document.getElementById("txtNumber").value;
var regu = /^\d+$/;
//var regu = /^[1-9]\d*|0$/; 亲测可用
if (val != "") {
if (!regu.test(val)) {
document.getElementById("labResult").style.color = "red";
document.getElementById("labResult").innerHTML = "验证失败！";
} else {
document.getElementById("labResult").style.color = "green";
document.getElementById("labResult").innerHTML = "验证成功！";
}
}
}
验证结果：
