js 输入限制

1.文本框输入限制

实现限制输入大、小写英文，数字，浮点小数，日期，中文<wbr>，部分英文，部分中文等众多功能。直接加入到html代码中即可使<wbr>用。

<script>
function regInput(obj, reg, inputStr)
{
var docSel = document．selection.createRange<wbr>()
if (docSel.parentElement().tagName != "INPUT") return false
oSel = docSel.duplicate()
oSel.text = ""
var srcRange = obj.createTextRange()
oSel.setEndPoint("StartToStart<wbr>", srcRange)
var str = oSel.text + inputStr + srcRange.text.substr(oSel.text.length)
return reg.test(str)
}
</script>

小写英文：<xmp style= "display:inline"> </xmp>
<input onkeypress = "return regInput(this, /^[a-z]*$/, String.fromCharCode(event.keyCode))"
onpaste = "return regInput(this, /^[a-z]*$/, window.clipboardData.getData('Text'))"
ondrop = "return regInput(this, /^[a-z]*$/, event.dataTransfer.getData('Text'))"
style="ime-mode:Disabled"><br>

大写英文：<xmp style= "display:inline"> </xmp>
<input onkeypress = "return regInput(this, /^[A-Z]*$/, String.fromCharCode(event.keyCode))"
onpaste = "return regInput(this, /^[A-Z]*$/, window.clipboardData.getData('Text'))"
ondrop = "return regInput(this, /^[A-Z]*$/, event.dataTransfer.getData('Text'))"
style="ime-mode:Disabled">
<br>

任意数字：<xmp style="display:inline"> </xmp>
<input onkeypress = "return regInput(this, /^[0-9]*$/, String.fromCharCode(event.keyCode))"
onpaste = "return regInput(this, /^[0-9]*$/, window.clipboardData.getData('Text'))"
ondrop = "return regInput(this, /^[0-9]*$/, event.dataTransfer.getData('Text'))"
style="ime-mode:Disabled"><br>

限2位小数：<xmp style="display:inline"> </xmp>
<input onkeypress = "return regInput(this, /^\d*\.?\d{0,2}$/,
String.fromCharCode(event.keyCode))"
onpaste = "return regInput(this, /^\d*\.?\d{0,2}$/,
window.clipboardData.getData('Text'))"
ondrop = "return regInput(this, /^\d*\.?\d{0,2}$/,
event.dataTransfer.getData('Text'))"
style="ime-mode:Disabled">

如: 123.12<br>

日　期：<xmp style="display:inline"> </xmp>

<input onkeypress = "return regInput(this, /^\d{1,4}
([-\/](\d{1,2}([-\/](\d{1,2})?<wbr>)?)?)?$/,
String.fromCharCode(event.keyCode))"

onpaste = "return regInput(this, /^\d{1,4}([-\/](\d{1,2}
([-\/](\d{1,2})?)?)?)?$/,
window.clipboardData.getData('Text'))"

ondrop = "return regInput(this, /^\d{1,4}([-\/](\d{1,2}
([-\/](\d{1,2})?)?)?)?$/,
event.dataTransfer.getData('Text'))"

style="ime-mode:Disabled">

如: 2002-9-29<br>

任意中文：<xmp style="display:inline"> </xmp>

<input onkeypress = "return regInput(this, /^$/,
String.fromCharCode(event.keyCode))"

onpaste = "return regInput(this, /^[\u4E00-\u9FA5]*$/,
window.clipboardData.getData('Text'))"

ondrop = "return regInput(this, /^[\u4E00-\u9FA5]*$/,
event.dataTransfer.getData('Text'))"><br>

部分英文：<xmp style="display:inline"> </xmp>
<input onkeypress = "return regInput(this, /^[a-e]*$/,
String.fromCharCode(event.keyCode))"

onpaste = "return regInput(this, /^[a-e]*$/,
window.clipboardData.getData('Text'))"

ondrop = "return regInput(this, /^[a-e]*$/,
event.dataTransfer.getData('Text'))"

style="ime-mode:Disabled">

范围: a,b,c,d,e<br>

部分中文：<xmp style="display:inline"> </xmp>
<script language=javascript>

function checkChinese(oldLength, obj)
{
var oTR = window.document．selection<wbr>.createRange()
var reg = /[^一二三四五六七八九十]/g
oTR.moveStart("character", -1*(obj.value.length-oldLength))
oTR.text = oTR.text.replace(reg, "")
}
</script>

<input onkeypress="return false" onkeydown=
"setTimeout('checkChinese('<wbr>+this.value.length+','+this<wbr>.uniqueID+')',
1)"

onpaste = "return regInput(this, /^[一二三四五六七八九十]*$/,
window.clipboardData.getData('Text'))"

ondrop = "return regInput(this, /^[一二三四五六七八九十]*$/,
event.dataTransfer.getData('Text'))">

范围: 一二三四五六七八九十<br>

2.不能展开右键，不能全选，不能复制的实现

<body oncontextmenu="window.event.returnvalue=false"
onkeypress="window.event.returnvalue=false"
onkeydown="window.event.returnvalue=false"
onkeyup="window.event.returnvalue=false"
ondragstart="window.event.returnvalue=false"
onselectstart="event.returnvalue=false">
...
</body>

3.禁止页面正文内容被选取

<body oncontextmenu="return false" ondragstart="return false"
onselectstart ="return false" onselect="document．selection<wbr>.empty()"
oncopy="document．selection<wbr>.empty()" onbeforecopy="return false"onmouseup="document<wbr>．selection.empty()">

4.避免别人把网页放在框架中

<script language=“javascript”>< /script>

5.禁示查看源代码

<frameset>
<frame src="你要保密的文件的URL">
</frameset>

6.关闭输入法

<input style="ime-mode:disabled">

7.禁止图片下载

在这里的最后加入：

oncontextmenu="return false" ondragstart="return false" onselectstart="return
false" scroll="auto"

8.禁止缓存

在HEAD里加入：

<meta http-equiv="Expires" CONTENT="0">
<meta http-equiv="Cache-Control" CONTENT="no-cache">
<meta http-equiv="Pragma" CONTENT="no-cache"></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>

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