1. 只允许输入数字,且禁止输入法
<html>
<head>
<script type='text/javascript' src='../../js/jquery.min.js' charset='utf-8'></script>
<script type="text/javascript">
$(function () {
$(".onlyFloat").keydown(function (e) {
if (((event.keyCode > 47) && (event.keyCode < 58)) || (event.keyCode == 8) || ((event.keyCode > 95) && (event.keyCode < 106))|| (event.keyCode == 110)) { // 判断键值
return true;
}
else {
return false;
}
}).focus(function () {
this.style.imeMode = 'disabled'; // 禁用输入法,禁止输入中文字符
});
})
</head>
<body>
<input type="text" class="onlyFloat" />
</body>
</html>
动态添加的输入框无法绑定监听事件，如果还需要限制其输入，就直接在标签中添加onkeydown事件，详见下例
2.只允许输入整数且不能超过某值
<html>
<head>
<script type='text/javascript' src='../../js/jquery.min.js' charset='utf-8'></script>
<script type="text/javascript">
function onlyNum(e) {
var maxnum = 90; //最大值
var oldnum = $(e).val(); //当前文本框中的数字
if ((event.keyCode > 36 && event.keyCode < 41) || (event.keyCode == 8)) {
return true;
}
else if (event.keyCode > 47 && event.keyCode < 58) { // 判断键值
var nownum =parseInt( oldnum + String.fromCharCode(event.keyCode));
if (nownum > maxnum) {
alert(0, "输入后的值大于限定值，不允许该健输入");
return false;
}
else {
return true;
}
}
else if (event.keyCode > 95 && event.keyCode < 106) {
var inputcontent = String.fromCharCode(event.keyCode);
switch (inputcontent) {
case "a": inputcontent="1"; break;
case "b": inputcontent = "2"; break;
case "c": inputcontent = "3"; break;
case "d": inputcontent = "4"; break;
case "e": inputcontent = "5"; break;
case "f": inputcontent = "6"; break;
case "g": inputcontent = "7"; break;
case "h": inputcontent = "8"; break;
case "i": inputcontent = "9"; break;
default: inputcontent = "0"; break;
}
var nownum = parseInt(oldnum + inputcontent);
if (nownum > maxnum) {
alert( "输入后的值大于限定值，不允许该健输入");
return false;
}
else {
return true;
}
}
else {
return false;
}
}
</script>
</head>
<body>
<input type="text" onkeydown="return onlyNum(this)" style="ime-mode:disabled; ">
</body>
</html>
3.radio选中改变触发事件
<html>
<head>
<script type='text/javascript' src='../../js/jquery.min.js' charset='utf-8'></script>
<script type="text/javascript">
$("input[type=radio][name=typestyle]").change(function () {
if (this.id == "radio_bq") {
}
else {
}
})
</script>
</head>
<body>
<input type="radio" name="typestyle" checked="checked" class="k_radio" id="radio_br" />冰刃
<input type="radio" name="typestyle" class="k_radio" id="radio_bq" />兵器
</body>
</html>
4.判断总复选框是否选中,遍历所有子复选框
<html>
<head>
<script type='text/javascript' src='../../js/jquery.min.js' charset='utf-8'></script>
<script type="text/javascript">
//点击全选
function AllCheckClick() {
var isAll = $("#drqAllCheckbox").is(':checked');
$.each($("#drqLeftList > table > tr"), function (k, v) {
var $checkbox = $(v).find("input[type='checkbox']");
if (isAll) {
$checkbox.prop("checked", "true");
} else {
$checkbox.removeAttr("checked");
}
});
}
</script>
</head>
<body>
<input type="checkbox" id="drqAllCheckbox" onclick="AllCheckClick()"/>
<div id="drqLeftList">
<table>
<tr>
<td><input type="checkbox"/></td>
<td></td>
</tr>
<tr>
<td><input type="checkbox"/></td>
<td></td>
</tr>
</table>
</div>
</body>
</html>
5. 打印页面某一块内容（内容块若带滚动条，使用下法不会出现只打印滚动条上部的情况），并去除页眉页脚，页面显示和打印时采用两套css
<html>
<head>
<script type='text/javascript' src='../../js/jquery.min.js' charset='utf-8'></script>
<script type="text/javascript">
function labelPrint(){
if (getExplorer() == "IE") {
pagesetup_null(); //删除打印页面的页眉页脚
}
var printhtml = $("#printdiv").html(); //获取div里的内容，不包括本身
//var printhtml = $("#printdiv").prop("outerHTML"); //获取div的内容，包括本身
var bodyHtml = document.body.innerHTML;
document.body.innerHTML = printhtml;
window.print();
document.body.innerHTML = bodyHtml;
}
//获取当前浏览器
function getExplorer() {
var explorer = window.navigator.userAgent;
//ie
if (explorer.indexOf("MSIE") >= 0) {
return "IE";
}
//firefox
else if (explorer.indexOf("Firefox") >= 0) {
return "Firefox";
}
//Chrome
else if (explorer.indexOf("Chrome") >= 0) {
return "Chrome";
}
//Opera
else if (explorer.indexOf("Opera") >= 0) {
return "Opera";
}
//Safari
else if (explorer.indexOf("Safari") >= 0) {
return "Safari";
}
}
//删除打印页面的页眉页脚
function pagesetup_null() {
var hkey_root, hkey_path, hkey_key;
hkey_root = "HKEY_CURRENT_USER";
hkey_path = "\Software\Microsoft\Internet Explorer\PageSetup\";
try {
var RegWsh = new ActiveXObject("WScript.Shell");
hkey_key = "header";
RegWsh.RegWrite(hkey_root + hkey_path + hkey_key, "");
hkey_key = "footer";
RegWsh.RegWrite(hkey_root + hkey_path + hkey_key, "");
//hkey_key = "margin_left";
//RegWsh.RegWrite(hkey_root + hkey_path + hkey_key, "0");
//RegWsh.sendKeys('%fu');
} catch (e) {
}
}
</script>
<style>
@media screen{
/*屏幕显示的css*/
}
@media print{
/*打印采用的css*/
/*@page{
size:A4 portrait;
margin-left:0;
}*/
}
/*公用的css*/
#printdiv{
border:1px solid;
}
</style>
</head>
<body>
<div id="buttonlist"> <a onclick="labelPrint()">打印</a></div>
<div id="printdiv"></div>
</body>
</html>
6.对数据序列化以及反序列化
<html>
<head>
<script type='text/javascript' src='../../js/jquery.min.js' charset='utf-8'></script>
<script src="../../js/json2.js"></script>
<script type="text/javascript">
function getContent(){
var contentlist=[];
var content={
name:$("#").val(),
age:$("#").val()
}
contentlist.push(content);
var contentlistjson=JSON2.stringify(contentlist); //序列化
JSON2.parse(contentlistjson) //反序列化
eval("(" + contentlistjson + ")"); //反序列化
}
</script>
</head>
<body>
</body>
</html>
7.获取单选框的选中值
<html>
<head>
<script type='text/javascript' src='../../js/jquery.min.js' charset='utf-8'></script>
<script type="text/javascript">
var name = $('input:radio:checked').val();
//var name = $("input[type='radio']:checked").val();
//var name = $("input[name='typestyle']:checked").val();
</script>
</head>
<body>
<input type="radio" name="typestyle" checked="checked" class="k_radio" id="radio_br" />冰刃
<input type="radio" name="typestyle" class="k_radio" id="radio_bq" />兵器
</body>
</html>
8.寻找某一元素的值
<html>
<head>
<script type='text/javascript' src='../../js/jquery.min.js' charset='utf-8'></script>
<script type="text/javascript">
function findTd() {
//$.each( $("#drqLeftList tr"),function(k,v){
// var text=$(this).find("td").eq(0).text();
//})
var text=$(#drqLeftList tr:first).find("td").eq(0).text(); //值为00
}
</script>
</head>
<body>
<div id="drqLeftList">
<table>
<tr>
<td>00</td>
<td>01</td>
</tr>
<tr>
<td>10</td>
<td>11</td>
</tr>
</table>
</div>
</body>
</html>
9.操作元素样式(参考：https://www.hellojava.com/a/84.html)
<html>
<head>
<script type='text/javascript' src='../../js/jquery.min.js' charset='utf-8'></script>
<script type="text/javascript">
$(function(){
$("#content").css("background"); //返回元素的背景颜色
$("#content").css("background","#ccc") //设定元素背景为灰色
$("#content").height(300); $("#msg").width("200"); //设定宽高
$("#content").css({ color: "red", background: "blue" });//以名值对的形式设定样式
$("#content").addClass("select"); //为元素增加名称为select的class
$("#content").removeClass("select"); //删除元素名称为select的class
$("#content").toggleClass("select"); //如果存在（不存在）就删除（添加）名称为select的class
})
</script>
</head>
<body>
<div id="content"></div>
</body>
</html>