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Reviews of shops latitude and longitude information

Source: Internet
Author: User
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Public reviews the map of the store does not find coordinates (latitude and longitude) information from the HTML source.
Analysis JS found that it is the coordinates (latitude and longitude) information is converted (anti-collection), is the POI parameter in HTML.

Take http://www.dianping.com/shop/4101814 shop as an example.

Part of the source file with POI (poi: ' HETSIFZVVHWATW ')

In which the following script

<script src= "//www.dpfile.com/s/js/p.pak.min.1361abe883291540eae764799aa98b95.js" type= "Text/javascript" > </script>
namely: View-source:http://www.dpfile.com/s/js/p.pak.min.1361abe883291540eae764799aa98b95.js

Decoding algorithm for POI with JavaScript implementation

Checkpoi:function (A, b) {
A | | (A = Array (b));
"Array"! = $type (a) && (A = Array (a));
for (var d = a.length,
c = 0; C < D; C + +) {
var f = A[c] | | "";
if (F.poi) {
var g = This.decode (F.poi);
F.lat = G.lat;
F.LNG = G.LNG;
Delete F.poi
}
if (!f.lat | |!f.lng) if (b) for (Var e in b) f[e] = B[e];
else A.splice (c, 1),
d--
}
b && 1 > A.length && (a = Array (b));
Return a
},
Decode:function (a) {
var B =-1,
d = 0,
c = "",
f = a.length,
g = A.charcodeat (f-1),
A = a.substring (0, f-1);
f--;
for (var e = 0; e < F; e++) {
var h = parseint (A.charat (e), This.options.settings.cha)-this.options.settings.add;
H >= this.options.settings.add && (H-= this.options.settings.plus);
c + = h.tostring (This.options.settings.cha);
H > D && (b = e, d = h)
}
A = parseint (c.substring (0, B), This.options.settings.digi);
b = parseint (c.substring (b + 1), This.options.settings.digi);
G = (A + b-parseint (g))/2;
b = (b-g)/1E5;
return {
LAT:B,
Lng:g/1E5
}
},

Resources

How to crawl (collect) public reviews web coordinates (latitude and longitude) information

Http://www.site-digger.com/html/articles/20111110/18.html

A further process after the demo JavaScript script is as follows:

<! DOCTYPE html>
<meta http-equiv= "Content-type" content= "text/html; Charset=utf-8 ">
<title>Demo</title>
<body>
<script type= "Text/javascript" >

function decode (C) {
var digi=16;
var add= 10;
var plus=7;
var cha=36;
var I =-1;
var H = 0;
var B = "";
var J = c.length;
var G = c.charcodeat (J-1);
C = c.substring (0, J-1);
j--;
for (var E = 0; E < J; e++) {
var D = parseint (C.charat (E), cha)-add;
if (D >= add) {
D = D-plus
}
B + = (D). toString (CHA);
if (D > H) {
I = E;
H = D
}
}
var A = parseint (b.substring (0, I), Digi);
var F = parseint (b.substring (I + 1), Digi);
var L = (A + f-parseint (G))/2;
var K = (f-l)/100000;
L/= 100000;
return {
Lat:k,
Lng:l
}
}
document.write (Decode (' Hhdfjgzvvihijg '). lat+ ', ' +decode (' HHDFJGZVVIHIJG '). LNG);
document.write ("<br/>");
document.write (Decode (' HETSIFZVVHWATW '). lat+ ', ' +decode (' HETSIFZVVHWATW '). LNG);

</script>

</body>

Reviews of shops latitude and longitude information

This article is an English version of an article which is originally in the Chinese language on aliyun.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to info-contact@alibabacloud.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

Related Keywords:
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