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<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>