当前位置: 首页 > 图文教程 > 网络编程 > Javascript > 为调试JavaScript添加输出窗口的代码

Javascript
javascript 响应键盘特定按键(只响应数字键)
javascript indexOf方法、lastIndexOf 方法和substring 方法
javascript parseInt 函数分析(转)
javascript Split方法,indexOf方法、lastIndexOf 方法和substring 方法
JavaScript 面向对象入门精简篇
JS中==与===操作符的比较
JavaScript indexOf忽略大小写
dwr spring的集成实现代码
DWR Ext 加载数据
JavaScript 计算当天是本年本月的第几周
Js 获取当前日期时间及其它操作实现代码
javascript multibox 全选
JS array 数组详解
javascript 对象定义方法 简单易学
javascript 补零 函数集合
div scroll始终在最底部的实现代码
javascript eval()用法
javascript 打印页面代码
JAVASCRIPT THIS详解 面向对象
javascript 页面跳转方法集合

Javascript 中的 为调试JavaScript添加输出窗口的代码


出处:互联网   整理: 软晨网(RuanChen.com)   发布: 2010-02-27   浏览: 358 ::
收藏到网摘: n/a

调试JavaScript是一件很麻烦的事,尽管有很多很好用的调试工具,但有时候想要跟踪值的变化,但即不想中断脚本执行,也不想用alert显示值信息,这种情况下,一般的做法是在页面上添加一个DIV或者其它元素,然后再往里面添加调试信息。 虽然不是很复杂的实现,但每次都要这样就会很麻烦,所以我写了一小段脚本,用来自动生成这个输出窗口。
代码
复制代码 代码如下:

window.Babu = {};
Babu.Debugging = {};
Babu.Debugging.writeLine = function(format, arg1, arg2) {
var console = Babu.Debugging._getConsole();
if (console.get_visible()) {
var msg = format;
if (typeof msg !== "undefined" && msg !== null) {
var index;
if (typeof msg === "string") {
var array = format.match(/\{(\d+)\}/g);
if (array) {
for (var i = 0; i < array.length; i++) {
index = array[i];
index = parseInt(index.substr(1, index.length - 2)) + 1;
msg = msg.replace(array[i], arguments[index]);
}
}
}
}
var span = document.createElement("SPAN");
span.appendChild(document.createTextNode(msg));
console._output.appendChild(span);
console._output.appendChild(document.createElement("BR"));
span.scrollIntoView();
return span;
}
}
Babu.Debugging._getConsole = function() {
var console = Babu.Debugging._console;
if (!console) {
var div = document.createElement("DIV");
div.style.position = "fixed";
div.style.right = "3px";
div.style.bottom = "3px";
div.style.width = "350px";
div.style.height = "180px";
div.style.backgroundColor = "white";
div.style.color = "black";
div.style.border = "solid 2px #afafaf";
div.style.fontSize = "12px";
document.body.appendChild(div);
Babu.Debugging._console = console = div;
div = document.createElement("DIV");
div.style.backgroundColor = "#e0e0e0";
div.style.position = "absolute";
div.style.left = "0px";
div.style.right = "0px";
div.style.top = "0px";
div.style.height = "16px";
div.style.padding = "2px 2px";
div.style.margin = "0px";
console.appendChild(div);
console._toolbar = div;
div = document.createElement("DIV");
div.style.overflow = "auto";
div.style.whiteSpace = "nowrap";
div.style.position = "absolute";
div.style.left = "0px";
div.style.right = "0px";
div.style.top = "20px";
div.style.bottom = "0px";
div.style.height = "auto";
console.appendChild(div);
console._output = div;
var btn;
btn = document.createElement("SPAN");
btn.innerHTML = "收缩";
btn.style.margin = "0px 3px";
btn.style.cursor = "pointer";
console._toolbar.appendChild(btn);
btn.onclick = function() { if (console.get_collapsed()) console.expand(); else console.collapse(); }
btn = document.createElement("SPAN");
btn.innerHTML = "清除";
btn.style.margin = "0px 3px";
btn.style.cursor = "pointer";
console._toolbar.appendChild(btn);
btn.onclick = Babu.Debugging.clearConsole;
btn = document.createElement("SPAN");
btn.innerHTML = "关闭";
btn.style.cursor = "pointer";
btn.style.margin = "0px 3px";
console._toolbar.appendChild(btn);
btn.onclick = function() { Babu.Debugging.hideConsole(); }
console.get_visible = function() { return this.style.display !== "none" };
console.get_collapsed = function() { return !(!this._collapseState) };
console.collapse = function() {
if (!this.get_collapsed()) {
this._output.style.display = "none";
this._toolbar.childNodes[1].style.display = "none";
this._toolbar.childNodes[2].style.display = "none";
this._toolbar.childNodes[0].innerHTML = "展开";
this._collapseState = { width: this.style.width, height: this.style.height }
this.style.width = "30px";
this.style.height = "16px";
}
}
console.expand = function() {
if (this.get_collapsed()) {
this._output.style.display = "";
this._toolbar.childNodes[1].style.display = "";
this._toolbar.childNodes[2].style.display = "";
this._toolbar.childNodes[0].innerHTML = "收缩";
this.style.width = this._collapseState.width;
this.style.height = this._collapseState.height;
this._collapseState = null;
}
}
}
return console;
}
Babu.Debugging.showConsole = function() {
Babu.Debugging._getConsole().style.display = "";
}
Babu.Debugging.hideConsole = function() {
var console = Babu.Debugging._console;
if (console) {
console.style.display = "none";
}
}
Babu.Debugging.clearConsole = function() {
var console = Babu.Debugging._console;
if (console) console._output.innerHTML = "";
}

调用方法很简单:
复制代码 代码如下:

Babu.Debugging.writeLine("调试信息");
Babu.Debugging.writeLine("带参数的调试信息:参数1={0},参数2={1}", arg1, arg2);

调用之后,会自动在窗口的右下角出现一个固定位置的窗口,并显示相应的内容。效果图请看下面: