javascript基础知识大集锦(二) 推荐收藏
2024-05-06 14:25:36
供稿：网友
详细看附件例子，还是写的比较简单的。
1.关于cookie的函数：
代码如下:
/**
* cookie操作工具.
* 使用方法:保存值:CookieTool('name','1',{expires: 7}) //表示保存一个cookie值为1,键值为name,失效时间7天以后
* 取值:CookieTool('name') //返回1
* @param {} name
* @param {} value
* @param {} options
* @return {}
*/
CookieTool = function(name, value, options) {
if (typeof value != 'undefined') {
options = options || {};
if (value === null) {
value = '';
options.expires = -1;
}
var expires = '';
if (options.expires && (typeof options.expires == 'number' || options.expires.toUTCString)) {
var date;
if (typeof options.expires == 'number') {
date = new Date();
date.setTime(date.getTime() + (options.expires * 24 * 60 * 60 * 1000));
} else {
date = options.expires;
}
expires = '; expires=' + date.toUTCString();
}
var path = options.path ? '; path=' + (options.path) : '';
var domain = options.domain ? '; domain=' + (options.domain) : '';
var secure = options.secure ? '; secure' : '';
document.cookie = [name, '=', encodeURIComponent(value), expires, path, domain, secure].join('');
} else {
var cookieValue = null;
if (document.cookie && document.cookie != '') {
var cookies = document.cookie.split(';');
for (var i = 0; i < cookies.length; i++) {
var cookie = trim(cookies[i]);
if (cookie.substring(0, name.length + 1) == (name + '=')) {
cookieValue = decodeURIComponent(cookie.substring(name.length + 1));
break;
}
}
}
return cookieValue;
}
};
2.关于一个可以查看js对象的js函数，很酷的方法:
代码如下:
/**
* 用来查看一个对象的属性
*/
function debugObjectInfo(obj){
traceObject(obj);
function traceObject(obj){
var str = '';
if(obj.tagName&&obj.name&&obj.id)
str="<table border='1' width='100%'><tr><td colspan='2' bgcolor='#ffff99'>traceObject tag: <"+obj.tagName+"> name = /""+obj.name+"/" id = /""+obj.id+"/" </td></tr>";
else{
str="<table border='1' width='100%'>";
}
var key=[];
for(var i in obj){
key.push(i);
}
key.sort();
for(var i=0;i<key.length;i++){
var v= new String(obj[key[i]]).replace(/</g,"<").replace(/>/g,">");
str+="<tr><td valign='top'>"+key[i]+"</td><td>"+v+"</td></tr>";
}
str=str+"</table>";
writeMsg(str);
}
function trace(v){
var str="<table border='1' width='100%'><tr><td bgcolor='#ffff99'>";
str+=String(v).replace(/</g,"<").replace(/>/g,">");
str+="</td></tr></table>";
writeMsg(str);
}
function writeMsg(s){
traceWin=window.open("","traceWindow","height=600, width=800,scrollbars=yes");
traceWin.document.write(s);
}
}
3.正则表达式：
