 
/* 
缺陷，當(dāng)前在ff3下，用jquery的 width()與height()函數(shù)，在不設(shè)置圖片的寬度與高度的時(shí)候，不能取到 
需要在圖片load函數(shù)里面初始化才可以 
*/ 
sanshi_imgareaselect = function(pic_id,view_div_id){ 
    this.pic_obj = jQuery("#"+pic_id); 
    this.pic_width; 
    this.pic_height; 
    this.view_div_id = view_div_id; 
    this.view_width = 100; 
    this.view_height = 100; 
    this.view_img_id = view_div_id+"_sanshi_img"; 
    this.ias; 
} 
//建立預(yù)覽圖片 
sanshi_imgareaselect.prototype.make_view_pic =function(){ 
    var img_obj = jQuery(document.createElement("IMG")); 
        img_obj.attr("src",this.pic_obj.attr("src")); 
        img_obj.attr("id",this.view_img_id); 
        img_obj.attr("width",this.view_width); 
        img_obj.attr("height",this.view_height); 
        return img_obj; 
} 
//初始化函數(shù) 
sanshi_imgareaselect.prototype.init=function(){ 
    this.pic_width = this.pic_obj.attr("width"); 
    this.pic_height = this.pic_obj.attr("height"); 
    //alert(this.pic_width+":"+this.pic_height); 
    //添加圖片 
    jQuery("#"+this.view_div_id).append(this.make_view_pic()); 
    //設(shè)置預(yù)覽加載層樣式 
    jQuery("#"+this.view_div_id).css({'width':this.view_width,'height':this.view_height,'overflow':'hidden'}); 
    //構(gòu)造選擇區(qū)域完成的函數(shù) 
    var fun_str="if ( selection.width && selection.height){ var scaleX = "+this.view_width+" / selection.width;var scaleY = "+this.view_height+" / selection.height;jQuery('#"+this.view_img_id+"').css({width: Math.round(scaleX * "+this.pic_width+"),height: Math.round(scaleY * "+this.pic_height+"),marginLeft: -Math.round(scaleX * selection.x1),marginTop: -Math.round(scaleY * selection.y1)});}"; 
    //alert(fun_str); 
    //初始化imgAreaSelect 函數(shù) 
    var ias = this.pic_obj.imgAreaSelect({ 
        //設(shè)置選擇框的比列 
        //aspectRatio:"1:1", 
        //設(shè)置框的添加效果 
        fadeSpeed:200, 
        //選擇框選擇完畢是否自己取消 
        autoHide:false, 
        //是否顯示圖片遮罩層 
        show:true, 
        //是否采用api 
        instance: true, 
        //設(shè)置初始函數(shù) 畫(huà)出選擇框 
        onInit:function(img, selection){ias.setSelection(100, 50, 250, 150, true);ias.update();}, 
        //設(shè)置選擇完畢的函數(shù)，采用了動(dòng)態(tài)執(zhí)行 
        onSelectEnd:function(img, selection){eval(fun_str);} 
        }); 
    //賦值給全局 
    this.ias = ias; 
} 
//保存事件 采用的是get方式提交 
sanshi_imgareaselect.prototype.save_pic=function(post_page,post_param){ 
    var opt = this.ias.getSelection(true); 
    var post_arr = new Array(); 
    jQuery.each(post_param,function(i,n){ 
        var temp_str =i+"="; 
        temp_str += opt[n] ? opt[n] : n; 
        post_arr.push(temp_str); 
    }); 
    //判斷，是否有參數(shù) 
    post_page += post_page.lastIndexOf("?")<0 ? "?" : "&"; 
    //拼裝get方式的url 
    post_url = post_page+post_arr.join("&"); 
    alert(post_url); 
} 

這個(gè)是封裝后js代碼
下面看看這段代碼如何使用

復(fù)制代碼代碼如下:

 
$(document).ready(function () { 

    //聲明函數(shù) 
    var sanshi_img = new sanshi_imgareaselect("mypic","preview"); 
    //確保圖片加載完成執(zhí)行初始化函數(shù)，這樣避免上面的提到的bug，否則不能保證兼容性 
    $("#mypic").load(function(){sanshi_img.init();}); 
    //監(jiān)聽(tīng)保存事件 
    $("#save_pic").click(function(){ 
        sanshi_img.save_pic('1.php?n=6',{"id":5,"px1":"x1","py1":"y1",'px2':"x2","py2":"y2",'pwidth':"width",'pheight':"height"}); 
    }); 
}) 

下面看下html代碼

復(fù)制代碼代碼如下:

 
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3c.org/TR/1999/REC-html401-19991224/loose.dtd"> 
<html xmlns="http://www.w3.org/1999/xhtml"> 
<head> 
<link rel="stylesheet" type="text/css" href="css/imgareaselect-animated.css" href="css/imgareaselect-animated.css" /> 
<script type="text/javascript" src="jquery-1.3.2.min.js" src="jquery-1.3.2.min.js"></script> 
<script type="text/javascript" src="scripts/jquery.imgareaselect.pack.js" src="scripts/jquery.imgareaselect.pack.js"></script> 
</head> 
<body> 
<div id="s"> 
<img id="mypic" name="mypic" dt="sanshi" src="scott-h-biram.jpg" src="scott-h-biram.jpg" title="mypic"/> 
</div> 
<div id="preview"></div> 
<div><input type="button" id="save_pic" value="保存"></div> 
</body> 
</html> 