javascript限制输入decimal

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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><title>javascript限制输入decimal</title><meta http-equiv="content-type" content="text/html; charset=UTF-8"></head><script>  function regInput(obj, reg, inputStr){var docSel= document.selection.createRange();if (docSel.parentElement().tagName != "INPUT")return false;oSel = docSel.duplicate();oSel.text = "";var srcRange = obj.createTextRange();oSel.setEndPoint("StartToStart", srcRange);var str = oSel.text + inputStr + srcRange.text.substr(oSel.text.length);return reg.test(str);}</script><body><!-- decimal(7,4)输入限制 -->    输入decimal(7,4) <input onkeypress = "return regInput(this, /^(\d{1,3}\.\d{0,4})$|^(\d{1,3}\.?)$/, String.fromCharCode(event.keyCode))"onpaste = "return regInput(this, /^(\d{1,3}\.\d{0,4})$|^(\d{1,3}\.?)$/, window.clipboardData.getData('Text'))"ondrop = "return regInput(this, /^(\d{1,3}\.\d{0,4})$|^(\d{1,3}\.?)$/, event.dataTransfer.getData('Text'))"style="ime-mode:Disabled"> 如：123.4567</body></html>