text只輸入數(shù)字

    比如這個(gè)框：<input type="text" name="yzm" size="4" maxlength="4" onBlur="regInput(this)" />
    檢驗(yàn)代碼
    <script language="javascript">
    function regInput(targ)
    {
    if(!/^-?\d*\.?\d{0,2}$/.test(targ.value)){targ.value='';targ.focus()}
    }
    </script>