jQuery实现多张图片上传预览（不经过后端处理）
效果图：
图（1）
图（2）
代码如下：
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>jQuery图片上传预览（不经过后端处理）</title>
<script src="http://libs.baidu.com/jquery/1.11.3/jquery.min.js"></script>
<style>
</style>
</head>
<body>
<div>
<img class="ImgPr"/>
<input type="file" class="up" />
</div>
<div>
<img class="ImgPr"/>
<input type="file" class="up" />
</div>
<script>
jQuery.fn.extend({
uploadPreview: function(opts) {
var _self = this,
_this = $(this);
opts = jQuery.extend({
Img: "ImgPr",
Width: 100,
Height: 100,
ImgType: ["gif", "jpeg", "jpg", "bmp", "png"],
Callback: function() {}
}, opts || {});
_self.getObjectURL = function(file) {
var url = null;
if (window.createObjectURL != undefined) {
url = window.createObjectURL(file)
} else if (window.URL != undefined) {
url = window.URL.createObjectURL(file)
} else if (window.webkitURL != undefined) {
url = window.webkitURL.createObjectURL(file)
}
return url
};
_this.change(function() {
if (this.value) {
if (!RegExp("\.(" + opts.ImgType.join("|") + ")$", "i").test(this.value.toLowerCase())) {
alert("选择文件错误,图片类型必须是" + opts.ImgType.join("，") + "中的一种");
this.value = "";
return false
}
//高版本Jquey使用 if ($.support.leadingWhitespace)
if ($.support.leadingWhitespace) { //低版本jquery中使用$.browser.msie
console.log(_self.getObjectURL(this.files[0]));
try {
_this.parent('div').find("." + opts.Img).attr('src', _self.getObjectURL(this.files[0]));
} catch (e) {
var src = "";
var obj = _this.parent('div').find("." + opts.Img);
var div = obj.parent("div")[0];
_self.select();
if (top != self) {
window.parent.document.body.focus()
} else {
_self.blur()
}
src = document.selection.createRange().text;
document.selection.empty();
obj.hide();
obj.parent("div").css({
'filter': 'progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod=scale)',
'width': opts.Width + 'px',
'height': opts.Height + 'px'
});
div.filters.item("DXImageTransform.Microsoft.AlphaImageLoader").src = src
}
} else {
_this.parent('div').find("." + opts.Img).attr('src', _self.getObjectURL(this.files[0]))
}
opts.Callback()
}
})
}
});
$(".up").click(function(){
$(this).uploadPreview({
Img: "ImgPr"
});
})
</script>
</body>
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