UEditor 的 ASP 版本在虚拟空间上传文件失败，提示“上传错误”或“上传失败，请重试”等，是因为其文件上传组件在创建目录时，没有网站目录外的访问权限。
例如上传文件的磁盘保存路径为：
D:\web\sitename\wwwroot\upload\20180523\123.jpg
百度编辑器的上传组件会依次判断以下目录是否存在，不存在则创建：
D:\
D:\web\
D:\web\sitename\
D:\web\sitename\wwwroot\
D:\web\sitename\wwwroot\upload\
D:\web\sitename\wwwroot\upload\20180523\
虚拟空间自动配置的网站根目录可能是：
D:\web\sitename\wwwroot\
所以，判断存在或创建以下目录没有问题：
D:\web\sitename\wwwroot\upload\
D:\web\sitename\wwwroot\upload\20180523\
但判断存在以下目录时会因为权限不足而失败：
D:\
D:\web\
D:\web\sitename\
解决方法是找到文件 asp/Uploader.Class.asp
找到 CheckOrCreatePath 这个 Function，替换为：
Private Function CheckOrCreatePath( ByVal path )
Set fs = Server.CreateObject("Scripting.FileSystemObject")
Dim parts
Dim root : root = Server.mappath("/") & "\"
parts = Split( Replace(path, root, ""), "\" )
path = root
For Each part in parts
path = path + part + "\"
If fs.FolderExists( path ) = False Then
fs.CreateFolder( path )
End If
Next
End Function另外，如果服务端无法通过 Request.Form 来接收该值，把 <form /> 放到 <table /> 外面试试。
或者绑定 contentChange 事件来赋值（不推荐）：
ue.addListener("contentChange", function() {
document.getElementsByName('xxxxxx')[0].value = ue.getContent();
});此方法的缺点是，不是所有操作都能触发 contentChange 事件，比如剪切、上传图片等。
改进方法（推荐）：在 form 提交之前赋值。
函数功能：添加/修改/删除/获取 URL 中的参数（锚点敏感）
/// <summary>
/// 设置 URL 参数（设 value 为 undefined 或 null 删除该参数）
/// <param name="url">URL</param>
/// <param name="key">参数名</param>
/// <param name="value">参数值</param>
/// </summary>
function fn_set_url_param(url, key, value) {
// 第一步：分离锚点
var anchor = "";
var anchor_index = url.indexOf("#");
if (anchor_index >= 0) {
anchor = url.substr(anchor_index);
url = url.substr(0, anchor_index);
}
// 第二步：删除参数
key = encodeURIComponent(key);
var patt;
// &key=value
patt = new RegExp("\\&" + key + "=[^&]*", "gi");
url = url.replace(patt, "");
// ?key=value&okey=value -> ?okey=value
patt = new RegExp("\\?" + key + "=[^&]*\\&", "gi");
url = url.replace(patt, "?");
// ?key=value
patt = new RegExp("\\?" + key + "=[^&]*$", "gi");
url = url.replace(patt, "");
// 第三步：追加参数
if (value != undefined && value != null) {
value = encodeURIComponent(value);
url += (url.indexOf("?") >= 0 ? "&" : "?") + key + "=" + value;
}
// 第四步：连接锚点
url += anchor;
return url;
}
/// <summary>
/// 获取 URL 参数（无此参数返回 null，多次匹配使用“,”连接）
/// <param name="url">URL</param>
/// <param name="key">参数名</param>
/// </summary>
function fn_get_url_param(url, key) {
key = encodeURIComponent(key);
var patt = new RegExp("[?&]" + key + "=([^&#]*)", "gi");
var values = [];
while ((result = patt.exec(url)) != null) {
values.push(decodeURIComponent(result[1]));
}
if (values.length > 0) {
return values.join(",");
} else {
return null;
}
}调用示例：
var url = window.location.href;
// 设置参数
url = fn_set_url_param(url, 'a', 123);
// 获取参数
console.log(fn_get_url_param, url, 'a');压缩版：
function fn_set_url_param(b,c,e){var a="";var f=b.indexOf("#");if(f>=0){a=b.substr(f);b=b.substr(0,f)}c=encodeURIComponent(c);var d;d=new RegExp("\\&"+c+"=[^&]*","gi");b=b.replace(d,"");d=new RegExp("\\?"+c+"=[^&]*\\&","gi");b=b.replace(d,"?");d=new RegExp("\\?"+c+"=[^&]*$","gi");b=b.replace(d,"");if(e!=undefined&&e!=null){e=encodeURIComponent(e);b+=(b.indexOf("?")>=0?"&":"?")+c+"="+e}b+=a;return b}
function fn_get_url_param(b,c){c=encodeURIComponent(c);var d=new RegExp("[?&]"+c+"=([^&#]*)","gi");var a=[];while((result=d.exec(b))!=null){a.push(decodeURIComponent(result[1]))}if(a.length>0){return a.join(",")}else{return null}};最近做到微信语音时用到，将微信的媒体文件（.amr）下载到自己服务器上，并转码为 .mp3 格式。
下载 FFmpeg for Windows，放在网站目录下，譬如：网站目录/bin/ffmpeg/ffmpeg.exe
转换代码
string amr = HttpRuntime.AppDomainAppPath + media.sLocalPath.Substring(1).Replace("/", @"\");
string mp3 = amr + ".mp3";
string ffmpeg = HttpRuntime.AppDomainAppPath + @"bin\ffmpeg\ffmpeg.exe";
Process p = new Process();
p.StartInfo.FileName = ffmpeg;
p.StartInfo.Arguments = $@"-y -i {amr} -ar {16000} {mp3}";
p.Start();
p.WaitForExit();
p.Close();-y 若有提示用户选择，默认“是”
-ar 采样数，微信的 amr 是 8000 Hz，如果不加这个参数转换后的 mp3 的也是 8000 Hz，但是音质下降严重，所以设成 16000 Hz 才勉强保持了音质。
WaitForExit() 是等待转码完毕才继续往下执行。
1. 跨子域的iframe高度自适应
2. 完全跨域的iframe高度自适应
同域的我们可以轻松的做到
1. 父页面通过iframe的contentDocument或document属性访问到文档对象，进而可以取得页面的高度，通过此高度值赋值给iframe tag。
2. 子页面可以通过parent访问到父页面里引入的iframe tag，进而设置其高度。
但跨域的情况则不允许对子页面或父页面的文档进行访问（返回undefined），所以我们要做的就是打通或间接打通这个壁垒。
一、跨子域的iframe高度自适应
比如 'a.jd.com/3.html' 嵌入了 'b.jd.com/4.html'，这种跨子域的页面
3.html
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|
4.html
|
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|
可以看到与上一篇对比，只要在两个页面里都加上document.domain就可以了
二、完全跨域的iframe高度自适应
分别有以下资源
- 页面 A：http://snandy.github.io/lib/iframe/A.html
- 页面 B：http://snandy.github.io/lib/iframe/B.html
- 页面 C：http://snandy.jd-app.com
- D.js：http://snandy.github.io/lib/iframe/D.js
这四个资源有如下关系
1. A里嵌入C，A和C是不同域的，即跨域iframe
2. C里嵌入B，C和B是不同域的，但A和B是同域的
3. C里嵌入D.js，D.js放在和A同域的项目里
通过一个间接方式实现，即通过一个隐藏的B.html来实现高度自适应。
A.html
嵌入页面C: http://snandy.jd-app.com
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|
B.html
嵌入在C页面中，它是隐藏的，通过parent.parent访问到A，再改变A的iframe(C.html)高度，这是最关键的，因为A，B是同域的所以可以访问A的文档对象等。
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|
C.html
嵌入在A中，和A不同域，要实现C的自适应，C多高则A里的iframe就设为多高。C里嵌入B.html 和 D.js
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|
D.js
在页面C载入后计算其高度，然后将计算出的height赋值给C里引入的iframe（B.html）的src
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线上示例：http://snandy.github.io/lib/iframe/A.html
Apple’s newest devices feature the Retina Display, a screen that packs double as many pixels into the same space as older devices. For designers this immediately brings up the question, “What can I do to make my content look outstanding on these new iPads and iPhones?”. First there are a few tough questions to consider, but then this guide will help you get started making your websites and web apps look amazingly sharp with Retina images!
Things to Consider When Adding Retina Images
The main issue with adding retina images is that the images are double as large and will take up extra bandwidth (this won’t be an issue for actual iOS apps, but this guide is covering web sites & web apps only). If your site is mostly used on-the-go over a 3G network it may not be wise to make all your graphics high-definition, but maybe choose only a select few important images. If you’re creating something that will be used more often on a WI-FI connection or have an application that is deserving of the extra wait for hi-res graphics these steps below will help you target only hi-res capable devices.
Simple Retina Images
The basic concept of a Retina image is that your taking a larger image, with double the amount of pixels that your image will be displayed at (e.g 200 x 200 pixels), and setting the image to fill half of that space (100 x 100 pixels). This can be done manually by setting the height and width in HTML to half the size of your image file.
<img src="my200x200image.jpg" width="100" height="100">
If you’d like to do something more advanced keep reading below for how you can apply this technique using scripting.
Creating Retina Icons for Your Website
When users add your website or web app to their homescreen it will be represented by an icon. These sizes for regular and Retina icons (from Apple) are as follows:
| iPhone | 57 x 57 |
|---|---|
| Retina iPhone | 114 x 114 |
| iPad | 72 x 72 |
| Retina iPad | 144 x 144 |
For each of these images you create you can link them in the head of your document like this (if you want the device to add the round corners remove -precomposed):
<link href="touch-icon-iphone.png" rel="apple-touch-icon-precomposed" />
<link href="touch-icon-ipad.png" rel="apple-touch-icon-precomposed" sizes="72x72" />
<link href="touch-icon-iphone4.png" rel="apple-touch-icon-precomposed" sizes="114x114" />
<link href="touch-icon-ipad3.png" rel="apple-touch-icon-precomposed" sizes="144x144" />
If the correct size isn’t specified the device will use the smallest icon that is larger than the recommended size (i.e. if you left out the 114px the iPhone 4 would use the 144px icon).
Retina Background Images
Background images that are specified in your CSS can be swapped out using media queries. You’ll first want to generate two versions of each image. For example ‘bgPattern.png’ at 100px x 100px and ‘bgPattern@2x.png’ at 200px x 200px. It will be useful to have a standard naming convention such as adding @2x for these retina images. To add the new @2x image to your site simply add in the media query below (You can add any additional styles that have background images within the braces of the same media query):
.repeatingPattern {
background: url(../images/bgPattern.png) repeat;
background-size: 100px 100px;
}
@media only screen and (-webkit-min-device-pixel-ratio: 2) {
.repeatingPattern {
background: url(../images/bgPattern@2x.png) repeat;
}
}
JavaScript for Retina Image Replacement
For your retina images that aren’t backgrounds the best option seems to be either creating graphics with CSS, using SVG, or replacing your images with JavaScript. Just like the background images, you’ll want to create a normal image and one ‘@2x’ image. Then with JavaScript you can detect if the pixel ratio of the browser is 2x, just like you did with the media query:
if (window.devicePixelRatio == 2) {
//Replace your img src with the new retina image
}
If you’re using jQuery you could quickly replace all your images like this very basic example below. It’s a good idea to add a class to identify the images with hi-res versions so you don’t replace any others by mistake. I’ve added a class=”hires” for this example. Also make sure you have the standard (non-retina) image height and width set in the HTML:
<img class="hires" alt="" src="search.png" width="100" height="100" />
<script type="text/javascript">
$(function () {
if (window.devicePixelRatio == 2) {
var images = $("img.hires");
// loop through the images and make them hi-res
for(var i = 0; i < images.length; i++) {
// create new image name
var imageType = images[i].src.substr(-4);
var imageName = images[i].src.substr(0, images[i].src.length - 4);
imageName += "@2x" + imageType;
//rename image
images[i].src = imageName;
}
}
});
</script>
Server-Side Retina Images
If you’d like to implement a server-side retina image solution, I recommend checking out Jeremy Worboys’ Retina Images (which he also posted in the comments below). His solution uses PHP code to determine which image should be served. The benefit of this solution is that it doesn’t have to replace the small image with the retina one so you’re using less bandwidth, especially if you have lots of images that you’re replacing.
Website Optimization for Retina Displays
If you’re looking for additional information on creating Retina images, I’ve recently had a short book published called Website Optimization for Retina Displays that covers a range of related topics. It contains some of what is above, but also includes samples for many different situations for adding Retina images. It explains the basics of creating Retina images, backgrounds, sprites, and borders. Then it talks about using media queries, creating graphics with CSS, embedding fonts, creating app icons, and more tips for creating Retina websites.
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常量：
整型，实型，布尔值，字符串型，null，undefined
变量：var
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除法运算：9/4 = 2.25 （而不是2）
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系统函数：
1，encodeURI URL编码
var urlStr=encodeURI("http://www.abc.com/?country=吴&name=z x");
结果：http://www.abc.com/?country=%E5%90%B4&name=z%20x
2，decodeURI URL解码
3，parseInt 将字符串按指定进制转换成一个整数,参数二表示进制
parseInt("32",10) 结果：32
parseInt("3c2",10) 结果：3
parseInt("c32",10) 结果：NaN
parseInt("0x18",10) 结果：0
parseInt("12",16) 结果18
4，parseFloat 将字符串转成小数
parseFloat("2.5") 结果：2.5
parseFloat("2.c5") 结果：2
parseFloat("c2.5") 结果：NaN
5，isNaN 用于检测parseInt和parseFloat返回是否为NaN
返回true/false
6，escape 编码
非ASCII替换为%xx
7，unescape 解码
8，eval 将字符串作为JS表达式执行，例
for(var i=0;i<3;i++) eval("var a"+i+"="+i);
相当于：
var a0=0; var a1=1; var a2=2;
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对象
1，Object
2，String
方法：
indexOf,
lastIndexOf,
match,使用正则表达式模式对字符串执行搜索，返回包含该搜索结果的数组
replace,
search,使用正则表达式搜索，第一个匹配的字符的位置
slice,截字符串：参数一，开始位置，参数二，结束位置（不指定或为-1时表示末位置）
split,返回一个字符串按照某种分隔标志符拆分为若干子字符串时所产生的字符串数组，分隔符可以是多个字符或一个正则表达式，它不作为任何数组元素的一部分返回。
substr,截字符串：参数一，开始位置，参数二，长度
toLowerCase,
toUpperCase,
3，Math（不能用new创建）
方法：
abs,绝对值
sin,cos,正余弦
asin,acos,反正余弦
random,返回介于0~1之间的伪随机数
例：var num = Math.randow();
4，Date
var currentTime=new Date();
//var currentTime=new Date(2002,3,4);
var strDate=currentTime.getYear()+"年";
strDate+=currentTime.getMonth()+"月";
strDate+=currentTime.getDate()+"日";
strDate+=currentTime.getHours()+":";
strDate+=currentTime.getMinutes()+":";
strDate+=currentTime.getSeconds()+" ";
strDate+=currentTime.getMilliseconds();
alert(strDate);
结果：2008年1月19日15:27:10 518
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数组
1，
var arr=["abc",123,'abc',,3.4];
for(var i=0;i<arr.length;i++)
{
alert(arr[i]);
}
2，用对象的方式实现数组
function MyArray(){this.length=arguments.length;for(var i=0;....
3，Array对象
var arr=new Array(2.4,"abc",2);
arr.sort(); //排序
alert的结果为 2 2,4 abc
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