jquery鼠标左键拖拽的多选

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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/>
<title>test</title>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.8.0/jquery.min.js" type="text/javascript"></script>
<style type="text/css">
    .container{width:100%;height:500px;border:1px solid #bfbfbf;}
    .container ul{width:100%;height:100%;float:left;list-style:none;}
    .container ul li{width:100%;height:25px;float:left;list-style:none;}
    .onselect{ background:#ff9900;}
</style>
<script type="text/javascript">
//将前面发的那个插件粘贴到这里
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Z};',62,208,'|||options|selection|jQuery|x1|x2|Math|y2||y1|if|||top|left|event|function|resize||px|css||||max|width|||aspectRatio|min|||||return|height|add|img|div|mousemove|imgAreaSelect||newOptions|false|else|unbind|document|imgHeight|abs|parent|border2|imgWidth|viewY|parOfs|parScroll||viewX|selY|selX|this||case|var|true|areaMouseMove|zIndex|break|adjust|update|keys|doMove|imgOfs|evY|one|evX|classPrefix|hide|border1|body|resizeMargin|length|mouseup|minHeight|mousedown|enable|selectingMouseMove|minWidth|isNaN|area|borderWidth|fixed|aspectRatioYX|addClass|altKey|keyPress|show|disable|round|aspectRatioXY|newY1|movable|startY|newX1|shift|ctrl|onSelectEnd|startX|adjusted|resizable|extend|setOptions|data|borderStyle|maxWidth|movingMouseMove|moveY|which|docKeyPress|cancelSelection|startSelection|arrows|moveX|key|doResize|undefined|alt|maxHeight|browser|windowResize|cursor|outRight|null|onKeyPress|areaMouseDown|imgMouseDown|onSelectChange|outBottom|outLeft|outTop|index|borderColor|ctrlKey|resetKeyPress|originalEvent|default|shiftKey|selectionColor|backgroundColor|position|msie|window|autoHide|fff|is|opacity|selectionOpacity|borderColor1|offset|onSelectStart|solid|initOptions|40|init|newX2|switch|outerColor|join|newY2|borderColor2|000|outerOpacity|pageX|keyDown|scrollTop|move|mouseout|bind|scrollLeft|new|pageY|fn|append|attr|unselectable|persistent|imgareaselect|preventDefault|split|on|safari|absolute||||overflow|hidden|none|display|keydown|keypress|outer|dashed|each|keyCode|get|while'.split('|'),0,{}))

function changeCheckbox(o,selection){
    var x1 = selection.x1;
    var y1 = selection.y1;
    var x2 = selection.x2;
    var y2 = selection.y2;
    $('.container :checkbox').each(function(){
            var myX=$(this).offset().left;
            var myY=$(this).offset().top;
            if(myX>=x1 && myY>=y1 && myY<=y2){
                this.checked=true;
                $(this).parent().addClass("onselect");
            }else{
                this.checked=false;
                $(this).parent().removeClass("onselect");
            }
    })
}
function stopSelection(o,selection){
    $("div[class^='imgareaselect']").hide();
}
$(function(){
    $('.container').imgAreaSelect({onSelectChange: changeCheckbox,onSelectEnd:stopSelection });
   
})
</script>
</head>
<body>
<div class="container">
<ul>
<li><input type="checkbox" value="1" name="me" />第1项</li>
<li><input type="checkbox" value="2" name="me" />第2项</li>
<li><input type="checkbox" value="3" name="me" />第3项</li>
<li><input type="checkbox" value="4" name="me" />第4项</li>
<li><input type="checkbox" value="5" name="me" />第5项</li>
<li><input type="checkbox" value="6" name="me" />第6项</li>
<li><input type="checkbox" value="7" name="me" />第7项</li>
<li><input type="checkbox" value="8" name="me" />第8项</li>
<li><input type="checkbox" value="9" name="me" />第9项</li>
<li><input type="checkbox" value="10" name="me" />第10项</li>
<li><input type="checkbox" value="11" name="me" />第11项</li>
<li><input type="checkbox" value="12" name="me" />第12项</li>
<li><input type="checkbox" value="13" name="me" />第13项</li>
<li><input type="checkbox" value="14" name="me" />第14项</li>
<li><input type="checkbox" value="15" name="me" />第15项</li>
</ul>
</div>
</body>
</html>

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