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如何让弹出窗口自适应图片的大小
解决思路：
主要思路是用window.open()方法打开一个窗口，然后再根据图片的大小resizeTo()窗口大小，必要时再用moveTo()方法调整窗口位置。现在问题在于如何获取图片的大小。
具体步骤：
images对象，只要设置图片源src后就可以用document.images[0].width和document.images[0].height获取图片的宽和高，不过要注意，要把窗口边框、标题栏高度和图片距边界的距离计算在内。
代码如下（popup_image.php）：
<script language=”javascript” type=”text/javascript”><!–
var i=0;
function resize() {
if (window.navigator.userAgent.indexOf(‘MSIE 6.0′) != -1 && window.navigator.userAgent.indexOf(‘SV1′) != -1) {
i=23; //IE 6.x on Windows XP SP2
} else if (window.navigator.userAgent.indexOf(‘MSIE 6.0′) != -1) {
i=50; //IE 6.x somewhere else
} else if (window.navigator.userAgent.indexOf(‘MSIE 7.0′) != -1) {
i=0; //IE 7.x
} else if (window.navigator.userAgent.indexOf(‘MSIE 8.0′) != -1) {
i=0; //IE 8.x
} else if (window.navigator.userAgent.indexOf(‘Firefox’) != -1 && window.navigator.userAgent.indexOf(“Windows”) != -1) {
i=0; //Firefox on Windows
} else if (window.navigator.userAgent.indexOf(‘Mozilla’) != -1 && window.navigator.userAgent.indexOf(“Windows”) != -1 && window.navigator.userAgent.indexOf(“MSIE”) == -1) {
i=45; //Mozilla on Windows, but not IE7
} else if (window.opera && document.childNodes) {
i=50; //Opera 7+
} else if (navigator.vendor == ‘KDE’ && window.navigator.userAgent.indexOf(“Konqueror”) != -1) {
i=-4; //Konqueror- this works ok with small images but not so great with large ones
//if you tweak it make sure i remains negative
} else {
i=70; //All other browsers
}
if (document.images[0]) {
imgHeight = document.images[0].height+235-i;
imgWidth = document.images[0].width+50;
var height = screen.height;
var width = screen.width;
var leftpos = width / 2 – imgWidth / 2;
var toppos = height / 2 – imgHeight / 2 +50;
window.moveTo(leftpos, toppos);
window.resizeTo(imgWidth, imgHeight);
}
self.focus();
}
//–></script>
在body加载函数：
<body onload=”resize();”>
下面为效果图：
