首页
所有分类
TAGS
文字工具 EMOJI BIBLE
编程 Javascript

JavaScript实现的图像模糊算法代码分享

Posted in Javascript onApril 22, 2014

项目中需要用到HTML5模糊图像，以前用GDI，GDI+中都有现成的组件来实现，HTML5中如何实现？
1.createImageData()
2.getImageData()
3.putImageData()
以上3个函数即可实现，用法和奥义，自己百度吧,我就不重复叙述了，没多大的意义。

以下是实现模糊算法的JS，其实还有种2B级算法就是分布矩阵，这样效率提高很多倍，不过效果很差，羽化的效果不强。
实现代码：

var mul_table = [
        512,512,456,512,328,456,335,512,405,328,271,456,388,335,292,512,
        454,405,364,328,298,271,496,456,420,388,360,335,312,292,273,512,
        482,454,428,405,383,364,345,328,312,298,284,271,259,496,475,456,
        437,420,404,388,374,360,347,335,323,312,302,292,282,273,265,512,
        497,482,468,454,441,428,417,405,394,383,373,364,354,345,337,328,
        320,312,305,298,291,284,278,271,265,259,507,496,485,475,465,456,
        446,437,428,420,412,404,396,388,381,374,367,360,354,347,341,335,
        329,323,318,312,307,302,297,292,287,282,278,273,269,265,261,512,
        505,497,489,482,475,468,461,454,447,441,435,428,422,417,411,405,
        399,394,389,383,378,373,368,364,359,354,350,345,341,337,332,328,
        324,320,316,312,309,305,301,298,294,291,287,284,281,278,274,271,
        268,265,262,259,257,507,501,496,491,485,480,475,470,465,460,456,
        451,446,442,437,433,428,424,420,416,412,408,404,400,396,392,388,
        385,381,377,374,370,367,363,360,357,354,350,347,344,341,338,335,
        332,329,326,323,320,318,315,312,310,307,304,302,299,297,294,292,
        289,287,285,282,280,278,275,273,271,269,267,265,263,261,259];   
var shg_table = [
         9, 11, 12, 13, 13, 14, 14, 15, 15, 15, 15, 16, 16, 16, 16, 17, 
        17, 17, 17, 17, 17, 17, 18, 18, 18, 18, 18, 18, 18, 18, 18, 19, 
        19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 20, 20, 20,
        20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 21,
        21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21,
        21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 22, 22, 22, 22, 22, 22, 
        22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22,
        22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 23, 
        23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23,
        23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23,
        23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 
        23, 23, 23, 23, 23, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 
        24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24,
        24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24,
        24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24,
        24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24 ];

function stackBlurImage( imageID, canvasID, radius, blurAlphaChannel )
{
     var img = document.getElementById( imageID );
    var w = img.naturalWidth;
    var h = img.naturalHeight;
    var canvas = document.getElementById( canvasID );
    canvas.style.width  = w + "px";
    canvas.style.height = h + "px";
    canvas.width = w;
    canvas.height = h;
    var context = canvas.getContext("2d");
    context.clearRect( 0, 0, w, h );
    context.drawImage( img, 0, 0 );
    if ( isNaN(radius) || radius < 1 ) return;
    if ( blurAlphaChannel )
        stackBlurCanvasRGBA( canvasID, 0, 0, w, h, radius );
    else 
        stackBlurCanvasRGB( canvasID, 0, 0, w, h, radius );
}

function stackBlurCanvasRGBA( id, top_x, top_y, width, height, radius )
{
    if ( isNaN(radius) || radius < 1 ) return;
    radius |= 0;
    var canvas  = document.getElementById( id );
    var context = canvas.getContext("2d");
    var imageData;
    try {
      try {
        imageData = context.getImageData( top_x, top_y, width, height );
      } catch(e) {
     
        try {
            netscape.security.PrivilegeManager.enablePrivilege("UniversalBrowserRead");
            imageData = context.getImageData( top_x, top_y, width, height );
        } catch(e) {
            alert("Cannot access local image");
            throw new Error("unable to access local image data: " + e);
            return;
        }
      }
    } catch(e) {
      alert("Cannot access image");
      throw new Error("unable to access image data: " + e);
    }
    var pixels = imageData.data;
    var x, y, i, p, yp, yi, yw, r_sum, g_sum, b_sum, a_sum, 
    r_out_sum, g_out_sum, b_out_sum, a_out_sum,
    r_in_sum, g_in_sum, b_in_sum, a_in_sum, 
    pr, pg, pb, pa, rbs;
    var div = radius + radius + 1;
    var w4 = width << 2;
    var widthMinus1  = width - 1;
    var heightMinus1 = height - 1;
    var radiusPlus1  = radius + 1;
    var sumFactor = radiusPlus1 * ( radiusPlus1 + 1 ) / 2;
    var stackStart = new BlurStack();
    var stack = stackStart;
    for ( i = 1; i < div; i++ )
    {
        stack = stack.next = new BlurStack();
        if ( i == radiusPlus1 ) var stackEnd = stack;
    }
    stack.next = stackStart;
    var stackIn = null;
    var stackOut = null;
    yw = yi = 0;
    var mul_sum = mul_table[radius];
    var shg_sum = shg_table[radius];
    for ( y = 0; y < height; y++ )
    {
        r_in_sum = g_in_sum = b_in_sum = a_in_sum = r_sum = g_sum = b_sum = a_sum = 0;
        r_out_sum = radiusPlus1 * ( pr = pixels[yi] );
        g_out_sum = radiusPlus1 * ( pg = pixels[yi+1] );
        b_out_sum = radiusPlus1 * ( pb = pixels[yi+2] );
        a_out_sum = radiusPlus1 * ( pa = pixels[yi+3] );
        r_sum += sumFactor * pr;
        g_sum += sumFactor * pg;
        b_sum += sumFactor * pb;
        a_sum += sumFactor * pa;
        stack = stackStart;
        for( i = 0; i < radiusPlus1; i++ )
        {
            stack.r = pr;
            stack.g = pg;
            stack.b = pb;
            stack.a = pa;
            stack = stack.next;
        }
        for( i = 1; i < radiusPlus1; i++ )
        {
            p = yi + (( widthMinus1 < i ? widthMinus1 : i ) << 2 );
            r_sum += ( stack.r = ( pr = pixels[p])) * ( rbs = radiusPlus1 - i );
            g_sum += ( stack.g = ( pg = pixels[p+1])) * rbs;
            b_sum += ( stack.b = ( pb = pixels[p+2])) * rbs;
            a_sum += ( stack.a = ( pa = pixels[p+3])) * rbs;
            r_in_sum += pr;
            g_in_sum += pg;
            b_in_sum += pb;
            a_in_sum += pa;
            stack = stack.next;
        }
        
        stackIn = stackStart;
        stackOut = stackEnd;
        for ( x = 0; x < width; x++ )
        {
            pixels[yi+3] = pa = (a_sum * mul_sum) >> shg_sum;
            if ( pa != 0 )
            {
                pa = 255 / pa;
                pixels[yi]   = ((r_sum * mul_sum) >> shg_sum) * pa;
                pixels[yi+1] = ((g_sum * mul_sum) >> shg_sum) * pa;
                pixels[yi+2] = ((b_sum * mul_sum) >> shg_sum) * pa;
            } else {
                pixels[yi] = pixels[yi+1] = pixels[yi+2] = 0;
            }
            r_sum -= r_out_sum;
            g_sum -= g_out_sum;
            b_sum -= b_out_sum;
            a_sum -= a_out_sum;
            r_out_sum -= stackIn.r;
            g_out_sum -= stackIn.g;
            b_out_sum -= stackIn.b;
            a_out_sum -= stackIn.a;
            p =  ( yw + ( ( p = x + radius + 1 ) < widthMinus1 ? p : widthMinus1 ) ) << 2;
            r_in_sum += ( stackIn.r = pixels[p]);
            g_in_sum += ( stackIn.g = pixels[p+1]);
            b_in_sum += ( stackIn.b = pixels[p+2]);
            a_in_sum += ( stackIn.a = pixels[p+3]);
            r_sum += r_in_sum;
            g_sum += g_in_sum;
            b_sum += b_in_sum;
            a_sum += a_in_sum;
            stackIn = stackIn.next;
            r_out_sum += ( pr = stackOut.r );
            g_out_sum += ( pg = stackOut.g );
            b_out_sum += ( pb = stackOut.b );
            a_out_sum += ( pa = stackOut.a );
            r_in_sum -= pr;
            g_in_sum -= pg;
            b_in_sum -= pb;
            a_in_sum -= pa;
            stackOut = stackOut.next;
            yi += 4;
        }
        yw += width;
    }
    
    for ( x = 0; x < width; x++ )
    {
        g_in_sum = b_in_sum = a_in_sum = r_in_sum = g_sum = b_sum = a_sum = r_sum = 0;
        yi = x << 2;
        r_out_sum = radiusPlus1 * ( pr = pixels[yi]);
        g_out_sum = radiusPlus1 * ( pg = pixels[yi+1]);
        b_out_sum = radiusPlus1 * ( pb = pixels[yi+2]);
        a_out_sum = radiusPlus1 * ( pa = pixels[yi+3]);
        r_sum += sumFactor * pr;
        g_sum += sumFactor * pg;
        b_sum += sumFactor * pb;
        a_sum += sumFactor * pa;
        stack = stackStart;
        for( i = 0; i < radiusPlus1; i++ )
        {
            stack.r = pr;
            stack.g = pg;
            stack.b = pb;
            stack.a = pa;
            stack = stack.next;
        }
        yp = width;
        for( i = 1; i <= radius; i++ )
        {
            yi = ( yp + x ) << 2;
            r_sum += ( stack.r = ( pr = pixels[yi])) * ( rbs = radiusPlus1 - i );
            g_sum += ( stack.g = ( pg = pixels[yi+1])) * rbs;
            b_sum += ( stack.b = ( pb = pixels[yi+2])) * rbs;
            a_sum += ( stack.a = ( pa = pixels[yi+3])) * rbs;
            r_in_sum += pr;
            g_in_sum += pg;
            b_in_sum += pb;
            a_in_sum += pa;
            stack = stack.next;
            if( i < heightMinus1 )
            {
                yp += width;
            }
        }
        yi = x;
        stackIn = stackStart;
        stackOut = stackEnd;
        for ( y = 0; y < height; y++ )
        {
            p = yi << 2;
            pixels[p+3] = pa = (a_sum * mul_sum) >> shg_sum;
            if ( pa > 0 )
            {
                pa = 255 / pa;
                pixels[p]   = ((r_sum * mul_sum) >> shg_sum ) * pa;
                pixels[p+1] = ((g_sum * mul_sum) >> shg_sum ) * pa;
                pixels[p+2] = ((b_sum * mul_sum) >> shg_sum ) * pa;
            } else {
                pixels[p] = pixels[p+1] = pixels[p+2] = 0;
            }
            r_sum -= r_out_sum;
            g_sum -= g_out_sum;
            b_sum -= b_out_sum;
            a_sum -= a_out_sum;
            r_out_sum -= stackIn.r;
            g_out_sum -= stackIn.g;
            b_out_sum -= stackIn.b;
            a_out_sum -= stackIn.a;
            p = ( x + (( ( p = y + radiusPlus1) < heightMinus1 ? p : heightMinus1 ) * width )) << 2;
            r_sum += ( r_in_sum += ( stackIn.r = pixels[p]));
            g_sum += ( g_in_sum += ( stackIn.g = pixels[p+1]));
            b_sum += ( b_in_sum += ( stackIn.b = pixels[p+2]));
            a_sum += ( a_in_sum += ( stackIn.a = pixels[p+3]));
            stackIn = stackIn.next;
            r_out_sum += ( pr = stackOut.r );
            g_out_sum += ( pg = stackOut.g );
            b_out_sum += ( pb = stackOut.b );
            a_out_sum += ( pa = stackOut.a );
            r_in_sum -= pr;
            g_in_sum -= pg;
            b_in_sum -= pb;
            a_in_sum -= pa;
            stackOut = stackOut.next;
            yi += width;
        }
    }
    context.putImageData( imageData, top_x, top_y );
}

function stackBlurCanvasRGB( id, top_x, top_y, width, height, radius )
{
    if ( isNaN(radius) || radius < 1 ) return;
    radius |= 0;
    var canvas  = document.getElementById( id );
    var context = canvas.getContext("2d");
    var imageData;
    try {
      try {
        imageData = context.getImageData( top_x, top_y, width, height );
      } catch(e) {
  
        try {
            netscape.security.PrivilegeManager.enablePrivilege("UniversalBrowserRead");
            imageData = context.getImageData( top_x, top_y, width, height );
        } catch(e) {
            alert("Cannot access local image");
            throw new Error("unable to access local image data: " + e);
            return;
        }
      }
    } catch(e) {
      alert("Cannot access image");
      throw new Error("unable to access image data: " + e);
    }
    var pixels = imageData.data;
    var x, y, i, p, yp, yi, yw, r_sum, g_sum, b_sum,
    r_out_sum, g_out_sum, b_out_sum,
    r_in_sum, g_in_sum, b_in_sum,
    pr, pg, pb, rbs;
    var div = radius + radius + 1;
    var w4 = width << 2;
    var widthMinus1  = width - 1;
    var heightMinus1 = height - 1;
    var radiusPlus1  = radius + 1;
    var sumFactor = radiusPlus1 * ( radiusPlus1 + 1 ) / 2;
    var stackStart = new BlurStack();
    var stack = stackStart;
    for ( i = 1; i < div; i++ )
    {
        stack = stack.next = new BlurStack();
        if ( i == radiusPlus1 ) var stackEnd = stack;
    }
    stack.next = stackStart;
    var stackIn = null;
    var stackOut = null;
    yw = yi = 0;
    var mul_sum = mul_table[radius];
    var shg_sum = shg_table[radius];
    for ( y = 0; y < height; y++ )
    {
        r_in_sum = g_in_sum = b_in_sum = r_sum = g_sum = b_sum = 0;
        r_out_sum = radiusPlus1 * ( pr = pixels[yi] );
        g_out_sum = radiusPlus1 * ( pg = pixels[yi+1] );
        b_out_sum = radiusPlus1 * ( pb = pixels[yi+2] );
        r_sum += sumFactor * pr;
        g_sum += sumFactor * pg;
        b_sum += sumFactor * pb;
        stack = stackStart;
        for( i = 0; i < radiusPlus1; i++ )
        {
            stack.r = pr;
            stack.g = pg;
            stack.b = pb;
            stack = stack.next;
        }
        for( i = 1; i < radiusPlus1; i++ )
        {
            p = yi + (( widthMinus1 < i ? widthMinus1 : i ) << 2 );
            r_sum += ( stack.r = ( pr = pixels[p])) * ( rbs = radiusPlus1 - i );
            g_sum += ( stack.g = ( pg = pixels[p+1])) * rbs;
            b_sum += ( stack.b = ( pb = pixels[p+2])) * rbs;
            r_in_sum += pr;
            g_in_sum += pg;
            b_in_sum += pb;
            stack = stack.next;
        }
        
        stackIn = stackStart;
        stackOut = stackEnd;
        for ( x = 0; x < width; x++ )
        {
            pixels[yi]   = (r_sum * mul_sum) >> shg_sum;
            pixels[yi+1] = (g_sum * mul_sum) >> shg_sum;
            pixels[yi+2] = (b_sum * mul_sum) >> shg_sum;
            r_sum -= r_out_sum;
            g_sum -= g_out_sum;
            b_sum -= b_out_sum;
            r_out_sum -= stackIn.r;
            g_out_sum -= stackIn.g;
            b_out_sum -= stackIn.b;
            p =  ( yw + ( ( p = x + radius + 1 ) < widthMinus1 ? p : widthMinus1 ) ) << 2;
            r_in_sum += ( stackIn.r = pixels[p]);
            g_in_sum += ( stackIn.g = pixels[p+1]);
            b_in_sum += ( stackIn.b = pixels[p+2]);
            r_sum += r_in_sum;
            g_sum += g_in_sum;
            b_sum += b_in_sum;
            stackIn = stackIn.next;
            r_out_sum += ( pr = stackOut.r );
            g_out_sum += ( pg = stackOut.g );
            b_out_sum += ( pb = stackOut.b );
            r_in_sum -= pr;
            g_in_sum -= pg;
            b_in_sum -= pb;
            stackOut = stackOut.next;
            yi += 4;
        }
        yw += width;
    }
    
    for ( x = 0; x < width; x++ )
    {
        g_in_sum = b_in_sum = r_in_sum = g_sum = b_sum = r_sum = 0;
        yi = x << 2;
        r_out_sum = radiusPlus1 * ( pr = pixels[yi]);
        g_out_sum = radiusPlus1 * ( pg = pixels[yi+1]);
        b_out_sum = radiusPlus1 * ( pb = pixels[yi+2]);
        r_sum += sumFactor * pr;
        g_sum += sumFactor * pg;
        b_sum += sumFactor * pb;
        stack = stackStart;
        for( i = 0; i < radiusPlus1; i++ )
        {
            stack.r = pr;
            stack.g = pg;
            stack.b = pb;
            stack = stack.next;
        }
        yp = width;
        for( i = 1; i <= radius; i++ )
        {
            yi = ( yp + x ) << 2;
            r_sum += ( stack.r = ( pr = pixels[yi])) * ( rbs = radiusPlus1 - i );
            g_sum += ( stack.g = ( pg = pixels[yi+1])) * rbs;
            b_sum += ( stack.b = ( pb = pixels[yi+2])) * rbs;
            r_in_sum += pr;
            g_in_sum += pg;
            b_in_sum += pb;
            stack = stack.next;
            if( i < heightMinus1 )
            {
                yp += width;
            }
        }
        yi = x;
        stackIn = stackStart;
        stackOut = stackEnd;
        for ( y = 0; y < height; y++ )
        {
            p = yi << 2;
            pixels[p]   = (r_sum * mul_sum) >> shg_sum;
            pixels[p+1] = (g_sum * mul_sum) >> shg_sum;
            pixels[p+2] = (b_sum * mul_sum) >> shg_sum;
            r_sum -= r_out_sum;
            g_sum -= g_out_sum;
            b_sum -= b_out_sum;
            r_out_sum -= stackIn.r;
            g_out_sum -= stackIn.g;
            b_out_sum -= stackIn.b;
            p = ( x + (( ( p = y + radiusPlus1) < heightMinus1 ? p : heightMinus1 ) * width )) << 2;
            r_sum += ( r_in_sum += ( stackIn.r = pixels[p]));
            g_sum += ( g_in_sum += ( stackIn.g = pixels[p+1]));
            b_sum += ( b_in_sum += ( stackIn.b = pixels[p+2]));
            stackIn = stackIn.next;
            r_out_sum += ( pr = stackOut.r );
            g_out_sum += ( pg = stackOut.g );
            b_out_sum += ( pb = stackOut.b );
            r_in_sum -= pr;
            g_in_sum -= pg;
            b_in_sum -= pb;
            stackOut = stackOut.next;
            yi += width;
        }
    }
    context.putImageData( imageData, top_x, top_y );
}
function BlurStack()
{
    this.r = 0;
    this.g = 0;
    this.b = 0;
    this.a = 0;
    this.next = null;
}

使用方法：

stackBlurImage( sourceImageID, targetCanvasID, radius, blurAlphaChannel );
stackBlurCanvasRGBA( targetCanvasID, top_x, top_y, width, height, radius );
stackBlurCanvasRGB( targetCanvasID, top_x, top_y, width, height, radius );

JavaScript实现的图像模糊算法代码分享

声明：登载此文出于传递更多信息之目的，并不意味着赞同其观点或证实其描述。

Javascript 相关文章推荐
复制Input内容的js代码_支持所有浏览器，修正了Firefox3.5以上的问题
Jun 21 Javascript
13 个JavaScript 性能提升技巧分享
Jul 26 Javascript
JavaScript加强之自定义callback示例
Sep 21 Javascript
简单的代码实现jquery定时器
Jan 03 Javascript
JavaScript DOM节点操作实例小结(新建,删除HTML元素)
Jan 19 Javascript
JavaScript中的工厂函数(推荐)
Mar 08 Javascript
express框架实现基于Websocket建立的简易聊天室
Aug 10 Javascript
jQuery plugin animsition使用小结
Sep 14 jQuery
详解如何将 Vue-cli 改造成支持多页面的 history 模式
Nov 20 Javascript
js判断数组是否包含某个字符串变量的实例
Nov 24 Javascript
小程序实现留言板
Nov 02 Javascript
微信小程序框架的页面布局代码
Aug 17 Javascript
JavaScript闭包实例讲解
Apr 22 #Javascript
JavaScript函数的4种调用方法详解
Apr 22 #Javascript
JavaScript实现存储HTML字符串示例
Apr 21 #Javascript
JavaScript获取flash对象与网上的有所不同
Apr 21 #Javascript
js unicode 编码解析关于数据转换为中文的两种方法
Apr 21 #Javascript
jquery form 加载数据示例
Apr 21 #Javascript
三种方式获取XMLHttpRequest对象
Apr 21 #Javascript
WebSockets(3) Apache(17) Hudi(1) 数据重复(1) Tkinter(4) Navigator(1) sortInts(1) Pool(1) GUI(2) feDisplacementMap(1)
You might like
我的php学习笔记(毕业设计)
2012/02/21 PHP
php微信公众平台交互与接口详解
2016/11/28 PHP
thinkphp 字母函数详解T/I/N/D/M/A/R/U
2017/04/03 PHP
Code：loadScript( )加载js的功能函数
2007/02/02 Javascript
JS 参数传递的实际应用代码分析
2009/09/13 Javascript
传智播客学习之java 反射
2009/11/22 Javascript
一些实用的jQuery代码片段收集
2011/07/12 Javascript
DOM和XMLHttpRequest对象的属性和方法整理
2012/01/04 Javascript
获取内联和链接中的样式(js代码)
2013/04/11 Javascript
javascript中直接引用Microsoft的COM生成Word
2014/01/20 Javascript
JavaScript实现广告弹窗效果
2016/08/09 Javascript
Javascript基于jQuery UI实现选中区域拖拽效果
2016/11/25 Javascript
浅析javaScript中的浅拷贝和深拷贝
2017/02/15 Javascript
详解从新建vue项目到引入组件Element的方法
2017/08/29 Javascript
基于匀速运动的实例讲解(侧边栏,淡入淡出)
2017/10/17 Javascript
详解Node.js读写中文内容文件操作
2018/10/10 Javascript
elementUI table表格动态合并的示例代码
2019/05/15 Javascript
基于JavaScript 实现拖放功能
2019/09/12 Javascript
python实现杨辉三角思路
2017/07/14 Python
python发送邮件实例分享
2017/07/28 Python
详解pandas安装若干异常及解决方案总结
2019/01/10 Python
Python+Redis实现布隆过滤器
2019/12/08 Python
python下对hsv颜色空间进行量化操作
2020/06/04 Python
python爬取2021猫眼票房字体加密实例
2021/02/19 Python
Speedo美国：澳大利亚顶尖泳衣制造商
2016/08/03 全球购物
美国领先的在线邮轮旅游公司：CruiseDirect
2018/06/07 全球购物
Otticanet美国：最顶尖的世界名牌眼镜, 能得到打折季的价格
2019/03/10 全球购物
中学家长会邀请函
2014/01/17 职场文书
淘宝活动策划方案
2014/02/06 职场文书
财务部总监岗位职责
2014/03/12 职场文书
村党支部书记承诺书
2014/05/29 职场文书
销售行政专员岗位职责
2014/06/10 职场文书
团日活动总结报告
2014/06/25 职场文书
保密法制宣传月活动总结
2015/05/07 职场文书
施工现场安全管理制度
2015/08/05 职场文书
MySQL中varchar和char类型的区别
2021/11/17 MySQL