Allow only numbers or decimal point input Javascript

/ **
* Text box only allows decimal point when entering numbers or call this method.
* Obj: the text box object
* /
function clearNoNum (obj) (
if (inNaN (obj.value)) (
obj.value = obj.value.replace (/ [^ \ d.] / g ,""); / / first replace all non-numbers, except numbers and.
obj.value = obj.value.replace (/ ^ \. / g ,"");// must ensure that digital rather than the first.
obj.value = obj.value.replace (/ \. (2,) / g ,"."); / / ensure that only the emergence of a. but no more.
/ / Guarantee. Only occurs once, and not more than twice
obj.value = obj.value.replace (".","$#$"). replace (/ \. / g ,""). replace ("$#$",".");
)
)
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