这个大概花了YQ一天多时间(虽然含杂大量酱油时间)，第一次做，惊现各种debug。网上说的果然没错——debug的时间比写程序的时间多……明显是因为自己没有在敲代码之前做好准备，忽略了很多细节，引以为戒。废话少说，以下是这次自学的笔记：?(￣?￣)?

添加了双击缩小放大窗口 & 改变窗口大小的预览效果

［博客文章网址，可运行代码查看效果］ == > ver = function() {

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if(bMousedowning) return false;

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changeCursor(true, this.index);

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};

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boxSide[i].onmouseout = function() {

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if(bMousedowning) return false;

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changeCursor(false, this.index);

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};

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boxSide[i].onmousedown = function(event) {

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var event = event || window.event;

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var index = this.index;

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var aBoxPrevious = new Array();         //记录box上一次的状态

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aBoxPrevious["clientX"] = event.clientX;

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aBoxPrevious["clientY"] = event.clientY;

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aBoxPrevious["left"] = box.offsetLeft;

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aBoxPrevious["top"]= box.offsetTop;

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aBoxPrevious["width"] = box.offsetWidth;

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aBoxPrevious["height"] = box.offsetHeight;

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bMousedowning = true;

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bSizeChanging = true;

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showVirtualBox(virtualBox, aBoxPrevious);

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document.onmousemove = function(event) {

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if(!bSizeChanging) return false;

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changeVirtualBoxSize(event, aBoxPrevious, index);

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};

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document.onmouseup = function() {

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changeBoxSize(virtualBox)

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hideVirtualBox(virtualBox);

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bSizeChanging = false;

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bMousedowning = false;

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changeCursor(false, index);

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};

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return false;

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};

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}

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//改变鼠标指针样式

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var changeCursor = function(bIsShowing, index) {

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if(bIsShowing) {

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var cursorStyle = ["n-resize","e-resize","s-resize","w-resize","ne-resize","se-resize","sw-resize","nw-resize"];

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document.body.style.cursor = cursorStyle[index];

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}

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else {

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document.body.style.cursor = "";

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}

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};

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//显示预览DIV

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var showVirtualBox = function(virtualBox, aBoxPrevious) {

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with(virtualBox.style) {

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display = "block";

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top = aBoxPrevious["top"] + "px";

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left = aBoxPrevious["left"] + "px";

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width = aBoxPrevious["width"] + "px";

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height = aBoxPrevious["height"] + "px";

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}

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}

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//隐藏预览DIV

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var hideVirtualBox = function(virtualBox) {

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virtualBox.style.display = "none";

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}

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//改变box大小

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var changeVirtualBoxSize = function(event, aBoxPrevious, index) {

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var event = event || window.event;

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var bTop = bRight = bBottom = bLeft = false;

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//八个方向，分别为N、E、S、W、NE、SW、SW、NW

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switch (index) {

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case 0:

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bTop = true;

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break;

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case 1:

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bRight = true;

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break;

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case 2:

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bBottom = true;

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break;

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case 3:

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bLeft = true;

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break;

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case 4:

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bTop = bRight = true;;

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break;

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case 5:

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bRight = bBottom = true;

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break;

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case 6:

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bBottom = bLeft = true;

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break;

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case 7:

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bLeft = bTop = true;

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break;

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default:

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break;

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}

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//向北改变高度

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if(bTop) {

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var newTopHeight = aBoxPrevious["height"] - (event.clientY - aBoxPrevious["clientY"]);

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(newTopHeight < originalHeight) && (newTopHeight = originalHeight);

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(newTopHeight > aBoxPrevious["top"] + aBoxPrevious["height"]) && (newTopHeight = aBoxPrevious["top"] + aBoxPrevious["height"]);

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var newTop = aBoxPrevious["top"] + (event.clientY - aBoxPrevious["clientY"]);

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(newTop > aBoxPrevious["top"] + aBoxPrevious["height"] - originalHeight) && (newTop = aBoxPrevious["top"] + aBoxPrevious["height"] - originalHeight);

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(newTop < 0) && (newTop = 0);

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virtualBox.style.top = newTop + "px";

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virtualBox.style.height = newTopHeight - box.clientTop * 2 + "px";      //不能忽略border-width

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bTop = false;

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}

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//向东改变宽度

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if(bRight) {

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var newRightWidth = aBoxPrevious["width"] + (event.clientX - aBoxPrevious["clientX"]);

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(newRightWidth < originalWidth) && (newRightWidth = originalWidth);

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(newRightWidth > document.body.scrollWidth - aBoxPrevious["left"]) && (newRightWidth = document.body.scrollWidth - aBoxPrevious["left"]);

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virtualBox.style.width = newRightWidth - box.clientTop * 2 + "px";

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bRight = false;

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}

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//向南改变高度

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if(bBottom) {

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var newBottomHeight = aBoxPrevious["height"] + (event.clientY - aBoxPrevious["clientY"]);

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(newBottomHeight < originalHeight) && (newBottomHeight = originalHeight);

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(newBottomHeight > document.body.scrollHeight - aBoxPrevious["top"]) && (newBottomHeight = document.body.scrollHeight - aBoxPrevious["top"]);

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virtualBox.style.height = newBottomHeight  - box.clientTop * 2 + "px";

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bBottom = false;

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}

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//向西改变宽度

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if(bLeft) {

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var newLeftWidth = aBoxPrevious["width"] - (event.clientX - aBoxPrevious["clientX"]);

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(newLeftWidth < originalWidth) && (newLeftWidth = originalWidth);

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(newLeftWidth > aBoxPrevious["left"] + aBoxPrevious["width"]) && (newLeftWidth = aBoxPrevious["left"] + aBoxPrevious["width"]);

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var newLeft = aBoxPrevious["left"] + (event.clientX - aBoxPrevious["clientX"]);

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(newLeft > aBoxPrevious["left"] + aBoxPrevious["width"] - originalWidth) && (newLeft = aBoxPrevious["left"] + aBoxPrevious["width"] - originalWidth);

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(newLeft < 0) && (newLeft = 0);

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virtualBox.style.left = newLeft + "px";

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virtualBox.style.width = newLeftWidth - box.clientLeft * 2 + "px";

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bLeft = false;

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}

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};

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var changeBoxSize = function(virtualBox) {

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with(box.style) {

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left = virtualBox.style.left;

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top = virtualBox.style.top;

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width = virtualBox.style.width;

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height = virtualBox.style.height;

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}

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}

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};

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//窗口按钮函数

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boxButton = function() {

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var box = document.getElementById("box");

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var boxHeader = document.getElementById("boxHeader");

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var aButton = document.getElementById("button").getElementsByTagName("div");

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var showButton = document.getElementById("showButton");

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var span = showButton.getElementsByTagName("span")[0];

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var bIsMin = bIsMax = false;        //目前状态是否最小 or 最大

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boxHeader.ondblclick = function() {

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maximize();

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}

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for(var i = 0; i < aButton.length; i++) {

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aButton[i].index = i;

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aButton[i].onmouseover = function() {

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aButton[this.index].style.background = "#AAA";

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document.body.style.cursor = "pointer";

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};

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aButton[i].onmouseout = function() {

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aButton[this.index].style.background = "";

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document.body.style.cursor = ""

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};

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aButton[i].onclick = function() {

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switch(this.index) {

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case 0:

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minimize();

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break;

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case 1:

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maximize();

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break;

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case 2:

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close();

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break;

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default:

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break;

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}

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};

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}

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var minimize = function() {

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if(bIsMin) {

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resumeBox();

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bIsMin = false;

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}

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else {

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box.style.width = "89px";

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box.style.height = "32px";

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box.style.left = "2%";

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box.style.top = box.style.top = document.body.offsetHeight - box.offsetHeight - 15 + "px";

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bIsMin = true;

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bIsMax = false;

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}

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};

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var maximize = function() {

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if(bIsMax) {

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resumeBox();

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bIsMax = false;

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}

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else {

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box.style.width = document.body.scrollWidth - 10 + "px";

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box.style.height = document.body.scrollHeight - 10 + "px";

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box.style.left = "5px";

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box.style.top = "5px";

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bIsMax = true;

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bIsMin = false;

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}

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};

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var close = function() {

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box.style.display = "none";

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showButton.style.display = "block";

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};

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var resumeBox = function() {

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box.style.top = "30%";

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box.style.left = "40%";

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box.style.width = "250px";

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box.style.height = "150px";

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};

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showButton.onmousedown = function() {

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span.innerHTML = "^o^";

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};

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showButton.onclick = function() {

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this.style.display = "none";

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span.innerHTML = ">_423

resumeBox();

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box.style.display = "block";

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};

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};

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window.onload = function() {

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changeSize();

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dragDiv();

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boxButton();

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};

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《script》

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>_<

居然关掉人家，讨厌~

快打开

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