Question

我正在尝试验证表单字段并且是javascript的新手。我一直在使用！isNaN但这似乎只能检测出是否绝对没有数字。例如，在下面的例子中，如果我有'Willy，Fred5'进入输入字段，它似乎检测到字符串并且不返回false。我需要做的是检测输入字段中是否有一个数值。但似乎无法找到有效的答案。

function fnCheckName(strName) {
    strName.style.background = "#FFFFFF";
    var nameChk = strName.value;
    if (nameChk.indexOf(', ') < 0 || nameChk == "" || !isNaN(nameChk){
        strName.style.background = "#FBEC5D";
        return false}
        else {return true}

Answer 1

您需要添加RegExp：

function fnCheckName(strName) {
strName.style.background = "#FFFFFF";
var nameChk = strName.value;
if (/\d/.test(nameChk)){
        strName.style.background = "#FBEC5D";
        return false
    }
    else {return true}

/ ^ [a-zA-Z] + $ / - 仅检查字母（“fdsfjklr”为true）

/ ^（[^ 0-9] *）$ / - 仅检查数字（“4321”为真）

/ \ d / - 检查任何带数字的字符串（对于“fdslkj45”为真）

Answer 2

/\d/.test('foo5')
outputs: true

/\d/.test('foo')
outputs: false

/\d/.test('5')
outputs: true

因此，鉴于这些输入和输出，我认为您修改后的代码将是：

function fnCheckName(strName) {
  strName.style.background = "#FFFFFF";
  var nameChk = strName.value;
  if (nameChk.indexOf(', ') < 0 || nameChk == "" || !/\d/.test(nameChk)) {
    strName.style.background = "#FBEC5D";
    return false
  }
  else {
    return true
  }
}

Answer 3

试试这个Danrex

function fnCheckName(strName) {
    strName.style.background = "#FFFFFF";
    var nameChk = strName.value;
    var regNew = new RegExp(/^([^0-9]*)$/);
    if (regNew.test(nameChk)) {//If true i.e. no digit is in the string

    } else {//If false i.e. digit is in the string  

    }
}

或

function fnCheckName(strName) {
        strName.style.background = "#FFFFFF";
        var nameChk = strName.value;
        var regNew = new RegExp(/^([^0-9]*)$/);
        return (regNew.test(nameChk));
    };

Answer 4

尝试此更改，

function fnCheckName(strName) {
strName.style.background = "#FFFFFF";
var nameChk = strName.value;
var status = false;
for(var i=0;i<nameChk.length;i++){
  if(isNan(nameChk[i])==false)
    status = true;
  else
    status = false;
}
return status;
}

Answer 5

如果输入一个数字，则返回false，否则返回true

eval('/^[a-zA-Z]+$/').test('sfjd');

编辑

function fnCheckName(strName) {
        if( eval('/^[a-zA-Z]+$/').test(strName))
        {
            // this name not contains numbers
            // change background or every things that you want
            return true;
        }
        else
        {
            // this name has number or numbers
            // change background or every things that you want
            return false;

        }
    }

我可以在Javascript中找到输入字段是否包含数值

5 个答案: