高效程序员的五个好习惯

flyhawk1010 — Fri, 25 Aug 2006 03:09:00 GMT

从www.infoq.com上看到一篇文章,讲的是一个高效程序员五个好习惯,特摘录如下:
1.Constructor Performs Minimal Work(不要让构造函数太累着)
2.Methods Clearly Convey Their Intent(人如其名)
3.An Object Performs a Focused Set of Services(不要狗拿耗子多管闲事)
   how to categorize these object is worthy of considering.(entity object,service object,facade object)
4.State-Changing Methods Contain Minimal Behavior Logic(是非分明,不要纠缠不清)
   determine the boundary is a litttle difficult.
5.Behavior Methods Can Be Called in Any Order(让依赖离我们远点)
   个人觉得3,4,5体现的是如何划分领域模型和领域对象职责划分的问题.我想Martin flower的SRP应该是我们应该遵守的原则之一.其它的暂时没有想到啊,大家有建议么?

flyhawk1010 2006-08-25 11:09 发表评论

图片缩放(javascript)

flyhawk1010 — Mon, 21 Aug 2006 07:56:00 GMT

前几天到网上搜了一个用来缩放图片的程序,结果发现有时候图片会变的很小,要重新刷新一下才会变成合适的大小,觉得很纳闷,也没找出原因.干脆就又到网上搜了一个,这次是老外写的一个,感觉代码少了好多,效果还不错,代码如下: 原来的:
function drawImage(imgD, maxW, maxH) {
if(!imgD)return; var image = new Image();
image.src = imgD.src;
var dW=imgD.width;
var dH=imgD.height;
if(dW>maxW||dH>maxH){
var rationW=dW/maxW;
var rationH=dH/maxH;
    if(rationW     dW=dW/rationW;
    dH=dH/rationW;
    if(dW>0&&dH>0){
imgD.width=dW; imgD.height=dH;
}
}
新搜到的:
function scaleImage(img,v) {
   if(!img)return;
   floorSize = .26;
   ceilingSize = 1.0;
   v = floorSize + (v * (ceilingSize - floorSize));
   img.style.width = (v*190)+'px';
}
综合一下,得到:
function scaleImage(img,maxW,maxH) {
    if (!img) return;
    var dW=img.width;
    var dH=img.height;
    if(dW>maxW||dH>maxH){
      var rationW=dW/maxW;
      var rationH=dH/maxH;
      if(rationW    dW=dW/rationW;
    dH=dH/rationW;
    if(dW>0&&dH>0){
        img.style.width =dW+"px";
        img.style.height =dH+"px";
    }
    }
}

flyhawk1010 2006-08-21 15:56 发表评论

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高效程序员的五个好习惯

图片缩放(javascript)