1.js操作cookie
js原生操作cookie
document.cookie=”name=”+username;
编写函数
//写cookies
function setCookie(name,value)
{
var Days = 30;
var exp = new Date();
exp.setTime(exp.getTime() + Days*24*60*60*1000);
document.cookie = name + “=”+ escape (value) + “;expires=” + exp.toGMTString();
}
//读cookie
function getCookie(name)
{
var arr,reg=new RegExp(“(^| )”+name+”=([^;]*)(;|$)”);
if(arr=document.cookie.match(reg))
return unescape(arr[2]);
else
return null;
}
//删除cookie
function delCookie(name)
{
var exp = new Date();
exp.setTime(exp.getTime() – 1);
var cval=getCookie(name);
if(cval!=null)
document.cookie= name + “=”+cval+”;expires=”+exp.toGMTString();
}
2.js获取url
有时候会出现编码错误导致的乱码
function get_url_var(name)
{
var reg = new RegExp(“(^|&)”+ name +”=([^&]*)(&|$)”);
var r = window.location.search.substr(1).match(reg);
if(r!=null)return unescape(r[2]); return null;
}
3.jq ajax
$.ajax({
url:url
data:{
‘ui_cardnum’:ui_cardnum
},
type:’post’,
dataType:’json’,
success:function(data){
},
error:function(data) {
console.log(data);
}
});
4.js 操作localstorage
- 获取键值：localStorage.getItem(“key”)
- 设置键值：localStorage.setItem(“key”,”value”)
- 清除键值：localStorage.removeItem(“key”)
- 清除所有键值：localStorage.clear()
function jsReadFiles(files) {
if (files.length) {
var file = files[0];
var reader = new FileReader();//new一个FileReader实例
if (/text+/.test(file.type)) {//判断文件类型，是不是text类型
reader.onload = function() {
$(‘body’).append(” + this.result + ”);
}
reader.readAsText(file);
} else if(/image+/.test(file.type)) {//判断文件是不是imgage类型
reader.onload = function() {
$(‘body’).append(”);
}
reader.readAsDataURL(file);
}
}
}
function Base64() {
// private property
_keyStr = “ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=”;
// public method for encoding
this.encode = function (input) {
var output = “”;
var chr1, chr2, chr3, enc1, enc2, enc3, enc4;
var i = 0;
input = _utf8_encode(input);
while (i > 2;
enc2 = ((chr1 & 3) <> 4);
enc3 = ((chr2 & 15) <> 6);
enc4 = chr3 & 63;
if (isNaN(chr2)) {
enc3 = enc4 = 64;
} else if (isNaN(chr3)) {
enc4 = 64;
}
output = output +
_keyStr.charAt(enc1) + _keyStr.charAt(enc2) +
_keyStr.charAt(enc3) + _keyStr.charAt(enc4);
}
return output;
}
// public method for decoding
this.decode = function (input) {
var output = “”;
var chr1, chr2, chr3;
var enc1, enc2, enc3, enc4;
var i = 0;
input = input.replace(/[^A-Za-z0-9\+\/\=]/g, “”);
while (i < input.length) {
enc1 = _keyStr.indexOf(input.charAt(i++));
enc2 = _keyStr.indexOf(input.charAt(i++));
enc3 = _keyStr.indexOf(input.charAt(i++));
enc4 = _keyStr.indexOf(input.charAt(i++));
chr1 = (enc1 <> 4);
chr2 = ((enc2 & 15) <> 2);
chr3 = ((enc3 & 3) << 6) | enc4;
output = output + String.fromCharCode(chr1);
if (enc3 != 64) {
output = output + String.fromCharCode(chr2);
}
if (enc4 != 64) {
output = output + String.fromCharCode(chr3);
}
}
output = _utf8_decode(output);
return output;
}
// private method for UTF-8 encoding
_utf8_encode = function (string) {
string = string.replace(/\r\n/g,"\n");
var utftext = "";
for (var n = 0; n < string.length; n++) {
var c = string.charCodeAt(n);
if (c 127) && (c > 6) | 192);
utftext += String.fromCharCode((c & 63) | 128);
} else {
utftext += String.fromCharCode((c >> 12) | 224);
utftext += String.fromCharCode(((c >> 6) & 63) | 128);
utftext += String.fromCharCode((c & 63) | 128);
}
}
return utftext;
}
// private method for UTF-8 decoding
_utf8_decode = function (utftext) {
var string = “”;
var i = 0;
var c = c1 = c2 = 0;
while ( i < utftext.length ) {
c = utftext.charCodeAt(i);
if (c 191) && (c < 224)) {
c2 = utftext.charCodeAt(i+1);
string += String.fromCharCode(((c & 31) << 6) | (c2 & 63));
i += 2;
} else {
c2 = utftext.charCodeAt(i+1);
c3 = utftext.charCodeAt(i+2);
string += String.fromCharCode(((c & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63));
i += 3;
}
}
return string;
}
}
json对象 字符型 互转
$.stringifyJSON()
$.parseJSON()