jquery一些简单的小技巧

<input type= button value="反选" id="aa" onclick="check()">

<hr>

<input type=checkbox class="chk"> <br>

<input type=checkbox class="chk"> <br>

<input type=checkbox class="chk"> <br>

<input type=checkbox class="chk"> <br>

<input type=checkbox class="chk"> <br>

<input type=checkbox class="chk"> <br>

<script>

function check(status)

{

//这里的obj是dom

$(".chk").each(

function(i,obj){

obj.checked=!obj.checked;

}

);

}

</script>

<input type= button value="删除" id="aa" onclick="check()">

<hr>

<input type=checkbox class="chk"> <br>

<input type=checkbox class="chk"> <br>

<input type=checkbox class="chk"> <br>

<input type=checkbox class="chk"> <br>

<input type=checkbox class="chk"> <br>

<input type=checkbox class="chk"> <br>

<script>

function check(status)

{

if ($(".chk:checked").size()<1)

{

alert("请选中先");

return;

}

}

</script>

<input type= button value="反选" id="aa" onclick="check()">

<hr>

<input type=checkbox class="chk"> <br>

<input type=checkbox class="chk"> <br>

<input type=checkbox class="chk"> <br>

<input type=checkbox class="chk"> <br>

<input type=checkbox class="chk"> <br>

<input type=checkbox class="chk"> <br>

<script>

function check(status)

{

//这里的obj是dom

$(".chk").each(

function(i,obj){

obj.checked=!obj.checked;

}

);

}

</script>

<select multiple id="left">

<option value="九阴真经">九阴真经</option>

<option value="九阴真经">九阳神功</option>

<option value="九阴真经">一阳指</option>

<option value="九阴真经">玉女心经</option>

</select>

<input type=button value=">" onclick="left2right()">

<select id="right" multiple>

</select>

<script>

function left2right()

{

$("#left>option:selected").remove().appendTo($("#right"));

}

</script>