javascript 常用函数

插入光标所在的Text

<input onblur="global=this"><br/>
<input onblur="global=this"><br/>
<input type=button value=meizz onclick="mm()">
<SCRIPT LANGUAGE="javascript">
var global = null; //记录是要在哪个文本框里插入
function mm()
{
var old = window.clipboardData.getData("Text");
var txt = window.prompt("请输入", "");
if(txt && global)
{
    window.clipboardData.setData("Text", txt);
    global.focus();
    document.execCommand('Paste');
    global=null;
}
window.clipboardData.setData("Text", old);
}
</SCRIPT>

按回车提交

<script language="javascript">
<!--
document.onkeydown=function()
{
    loginform.submit()
}
//-->
</script>

改变td的状态

<script>
function Click_B(){
div1.innerHTML = "<input type=text id=t1>";
//div1.innerTEXT = "test";
}
function Click_B2(){
div1.innerHTML = t1.value;
}
</script>
<table><tr><td><div id=div1>点击以前</div></td></tr></table>
<input type=button value="更改" onclick="Click_B()">
<input type=button value="保存" onclick="Click_B2()">

判断复选框是否选中

<script language="javascript">
<!--
function check()
{
    var o1 = document.getElementsByName('r');
    var o2 = document.getElementsByName('c');
    var i;
    var j=0,p=0;
    for(i=0;i<o1.length;i++)
    {
      if(o1[i].checked)
      {
        alert('选中的单选按钮ID：'+o1[i].id);
        j++;
      }
    }
    if(j==0) alert('没选择单选按钮！');
    for(i=0;i<o2.length;i++)
    {
      if(o2[i].checked)
      {
        alert('选中的多选按钮ID：'+o2[i].id);
        p++;
      }
    }
    if(p==0) alert('没选择多选按钮！');
}
//-->
</script>

<input type=radio name=r id=r1>r1
<input type=radio name=r id=r2>r2
<input type=radio name=r id=r3>r3
<br>
<input type=checkbox name=c id=c1>c1
<input type=checkbox name=c id=c2>c2
<input type=checkbox name=c id=c3>c3
<input type=checkbox name=c id=c4>c4
<input type=checkbox name=c id=c5>c5
<p><input type=button value=check onclick="check();"></p>

取Input的值

<script language="javascript">
<!--
function check()
{
    var o = document.getElementsByTagName('INPUT');
    for(var i=0;i<o.length;i++)
    {
      if(o[i].type == 'radio' && o[i].checked) alert('选中单选框的value：'+o[i].value);
      if(o[i].type == 'checkbox' && o[i].checked) alert('选中复选框的value：'+o[i].value);
    }
}
//-->
</script>

全选

<form name=meizz>
<input type=checkbox name=All onclick="checkAll('mm')">??<br/>
<input type=checkbox name=mm onclick="checkItem('All')"><br/>
<input type=checkbox name=mm onclick="checkItem('All')"><br/>
<input type=checkbox name=mm onclick="checkItem('All')"><br/>
<input type=checkbox name=mm onclick="checkItem('All')"><br/>
<input type=checkbox name=mm onclick="checkItem('All')"><br/><br/>

<input type=checkbox name=All2 onclick="checkAll('mm2')">??<br/>
<input type=checkbox name=mm2 onclick="checkItem('All2')"><br/>
<input type=checkbox name=mm2 onclick="checkItem('All2')"><br/>
<input type=checkbox name=mm2 onclick="checkItem('All2')"><br/>
<input type=checkbox name=mm2 onclick="checkItem('All2')"><br/>
<input type=checkbox name=mm2 onclick="checkItem('All2')"><br/>

</form>

<SCRIPT LANGUAGE="JavaScript">
function checkAll(str)
{
var a = document.getElementsByName(str);
var n = a.length;
for (var i=0; i<n; i++)
a[i].checked = window.event.srcElement.checked;
}
function checkItem(str)
{
var e = window.event.srcElement;
var all = eval("document.meizz."+ str);
if (e.checked)
{
    var a = document.getElementsByName(e.name);
    all.checked = true;
    for (var i=0; i<a.length; i++)
    {
      if (!a[i].checked){ all.checked = false; break;}
    }
}
else all.checked = false;
}
</SCRIPT>

<input type=radio name=r value=1>
<input type=radio name=r value=2>
<input type=radio name=r value=3>
<p>
<input type=checkbox name=c value=1>
<input type=checkbox name=c value=2>
<input type=checkbox name=c value=3>
<p>
<input type=button value=check onclick="check();">

如何进行全文替换

<script>
var strText = new String() ;
strText="<input type=text><input type=submit>"
alert( strText ) ;
var re = new RegEXP ("<", "gi") ;
var newstr = strText.replace(re, "&lt") ;
alert( newstr ) ;
</script>

时间格式

<script language=javascript>
alert("2004-9-3".replace(/\-(\d{1})/ig,"-0$1"))
</script>

<script language="vbScript" >
set re = new RegExp
re.Pattern = "\-(\d{1})"
re.Global = true
msgbox re.Replace("2004-9-3", "-0$1")
set re =nothing
</script>

中文标点的判断

<input type=text name=a>
<input type=button value="提交" onclick="chk()">

<script language="JavaScript">

function chk()
{
b=/^\s*[A-Za-z0-9\u4e00-\u9fa5，。；：“”‘’！？、]*\s*$/;
c=document.all.a.value;
if (c.replace(b,"")!="")
{
alert("您输入了非法字符");
}

}
</script>