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zhjzh_zjz 2003-05-18
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if(isNaN(yourValue))alert("你输入的不是数字")
else alert("是数字")
else alert("是数字")
ffs 2003-05-18
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if(isNaN(form.text_name.value))
{
alert('it is NOT a number')
}
else
{
alert('it is a number')
}
{
alert('it is NOT a number')
}
else
{
alert('it is a number')
}
jumpray 2003-05-18
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It's very kind of you,thx.
lu_yanfeng 2003-05-18
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Use RegularExpression:
function checkStuNo() {
var input = form.text.value;
if (input.length) {
alert("You haven't inputted yet!");
return false;
} else if (input.match(/[^0-9]/)) {
alert("Please input a number!");
return false;
} else
return true;
}
function checkStuNo() {
var input = form.text.value;
if (input.length) {
alert("You haven't inputted yet!");
return false;
} else if (input.match(/[^0-9]/)) {
alert("Please input a number!");
return false;
} else
return true;
}
