我正在开发一个关于iBeacons的应用程序，我做了if条件来显示我想要的页面，但是当开始扫描时，变量设置为零我猜。我所指的代码始于beacon.address，我不知道如何解决这个问题，任何人都可以帮助我吗？
function uint8ArrToHexStringNoSpace(arr) {
return Array.prototype.map.call(arr, function(n) {
var s = n.toString(16);
if(s.length == 1) {
s = '0'+s;
}
return s;
}).join('');
}
function appendTd(root, value, id) {
var text = document.createTextNode(value);
var td = document.createElement("p");
if(id) {
td.id = id;
}
td.appendChild(text);
root.appendChild(td);
}
function hex16(i) {
var s = i.toString(16);
while(s.length < 4) {
s = '0'+s;
}
return s;
}
var beacons = {};
var app = {
initialize: function() {
// Important to stop scanning when page reloads/closes!
window.addEventListener('beforeunload', function(e)
{
iBeacon.stopScan();
});
this.bindEvents();
},
bindEvents: function() {
document.addEventListener('deviceready', this.onDeviceReady, false);
},
onDeviceReady: function() {
//app.receivedEvent('deviceready');
app.startScan();
},
receivedEvent: function(id) {
var parentElement = document.getElementById(id);
var listeningElement = parentElement.querySelector('.listening');
var receivedElement = parentElement.querySelector('.received');
listeningElement.setAttribute('style', 'display:none;');
receivedElement.setAttribute('style', 'display:block;');
console.log('Received Event: ' + id);
},
startScan: function() {
iBeacon.startScan({}, function(beacon) {
//console.log("beacon found: "+beacon.address+" "+beacon.name+" "+beacon.rssi+"/"+beacon.txPower);
var r = beacon.region;
//console.log("M"+r.major.toString(16)+" m"+r.minor.toString(16)+" uuid "+uint8ArrToHexStringNoSpace(r.uuid));
var key = 'tx'+beacon.address.replace(/:/g,'_');
//console.log('key: '+key);
if(beacons[key] == null) {
beacons[key] = beacon;
var root = document.getElementById("beaconListRoot");
var tr = document.createElement("tr");
var br = document.createElement("br");
// <tr><td>Address</td><td>Name</td><td>RSSI</td><td>ID</td><td>UUID</td></tr>
var adress = ' Adress: ';
var name = ' Name: ';
var distance = ' distance: ';
var major = ' Major: ';
var minor = 'Minor: ';
var UUID = ' UUID: ';
appendTd(tr, adress + beacon.address + name + beacon.name);
appendTd(tr, distance + beacon.rssi+" /"+beacon.txPower+"\u00A0"+beacon.estimatedDistance.toFixed(2)+'m', key);
appendTd(tr, major + hex16(r.major)+"\u00A0"+ minor +hex16(r.minor));
appendTd(tr, UUID + uint8ArrToHexStringNoSpace(r.uuid));
root.appendChild(tr);
var bool = 1;
} else {
var td = document.getElementById(key);
td.firstChild.nodeValue = 'Power: ' + beacon.rssi+"/"+beacon.txPower+ ' Distance: ' + "\u00A0"+beacon.estimatedDistance.toFixed(2)+'m';
bool = bool + 1;
}
if(beacon.address == '78:A5:04:13:3B:17' && beacon.estimatedDistance.toFixed(2) <= 10 && bool == 1){
bool = bool + 1;
window.open("info.html");
}
}, function(error) {
console.log("startScan error: " + error);
});
},
};
<ion-view view-title="IBEACON">
<ion-content>
<table class="beaconList">
<tbody id="beaconListRoot">
<!--<tr><td> Address </td><td> Name </td><td> RSSI </td><td> ID </td><td> UUID </td></tr>-->
</tbody>
</table>
</ion-content>
</ion-view>
我的问题在于那部分，因为变量设置为零，结果是页面随时打开：
if(beacon.address == '78:A5:04:13:3B:17' && beacon.estimatedDistance.toFixed(2) <= 10 && bool == 1){
bool = bool + 1;
window.open("info.html");
}
这是我正在使用的所有内容，我已经了解了这个ibeacon项目并且我已经更新了一点。我不知道我在使用什么图书馆。
function b64ToUint6 (nChr) {
return nChr > 64 && nChr < 91 ?
nChr - 65
: nChr > 96 && nChr < 123 ?
nChr - 71
: nChr > 47 && nChr < 58 ?
nChr + 4
: nChr === 43 ?
62
: nChr === 47 ?
63
:
0;
}
function base64DecToArr (sBase64, nBlocksSize) {
var
sB64Enc = sBase64.replace(/[^A-Za-z0-9\+\/]/g, ""), nInLen = sB64Enc.length,
nOutLen = nBlocksSize ? Math.ceil((nInLen * 3 + 1 >> 2) / nBlocksSize) * nBlocksSize : nInLen * 3 + 1 >> 2, taBytes = new Uint8Array(nOutLen);
for (var nMod3, nMod4, nUint24 = 0, nOutIdx = 0, nInIdx = 0; nInIdx < nInLen; nInIdx++) {
nMod4 = nInIdx & 3;
nUint24 |= b64ToUint6(sB64Enc.charCodeAt(nInIdx)) << 18 - 6 * nMod4;
if (nMod4 === 3 || nInLen - nInIdx === 1) {
for (nMod3 = 0; nMod3 < 3 && nOutIdx < nOutLen; nMod3++, nOutIdx++) {
taBytes[nOutIdx] = nUint24 >>> (16 >>> nMod3 & 24) & 255;
}
nUint24 = 0;
}
}
return taBytes;
}
function uint8ArrToHexString(arr) {
return Array.prototype.map.call(arr, function(n) {
var s = n.toString(16);
if(s.length == 1) {
s = '0'+s;
}
return s;
}).join(' ');
}
window.iBeacon = {
/** Start scanning for beacons.
* <p>Found devices and errors will be reported to the supplied callbacks.</p>
* <p>Will keep scanning indefinitely until you call stopScan().</p>
* <p>Calling this function while scanning is in progress will continue scanning with the new region.</p>
* @param {Region} region(s) - All components are optional. Beacons will be filtered based on the components that are present.
* If no components are present, all beacons in range will be reported.
* @param {scanCallback} win
* @param {failCallback} fail
*/
startScan: function(region, win, fail) {
evothings.ble.startScan(function(device) {
var sr = base64DecToArr(device.scanRecord);
//console.log("found device: srl " + sr.byteLength + "("+device.scanRecord.length+"), name: " + device.name);
//console.log(uint8ArrToHexString(sr));
//console.log(device.scanRecord);
var beacon = iBeacon.parseScanRecord(device, sr);
if(beacon) {
var filtered = (region && ((region.uuid && beacon.uuid != region.uuid) ||
(region.major && region.major != beacon.major) ||
(region.minor && region.minor != beacon.minor)));
if(filtered) {
return;
}
win(beacon);
} else {
//console.log(device.address+" ("+device.name+") was not an iBeacon.");
}
}, fail);
},
// returns a Beacon
parseScanRecord: function(device, sr) {
for(var pos = 2; pos < 6; pos++) {
if(sr[pos+0] == 0x4c &&
sr[pos+1] == 0x00 &&
sr[pos+2] == 0x02 &&
sr[pos+3] == 0x15)
{ // it's a beacon.
var uuid = new Uint8Array(sr.buffer, pos+4, 16);
//var ids = new Uint8Array(sr.buffer, pos+20, 2); // fails with "RangeError: softshould be a multiple ofr"
var ids = new Uint16Array(sr.buffer.slice(pos+20), 0, 2);
var b = device;
b.region = {
uuid: uuid,
major: ids[0],
minor: ids[1],
}
b.txPower = new Int8Array(sr.buffer, pos+24, 1)[0];
b.estimatedDistance = iBeacon.calculateAccuracy(b.rssi, b.txPower);
b.state = 0;
return b;
}
}
return null;
},
/** Describes an iBeacon region.
* @typedef {Object} Region
* @property {Uint8Array} uuid - 16 bytes long. Usually identifies the manufacturer of the beacon.
* @property {number} major - Unsigned 16-bit integer. Usually identifies a particular set of beacons.
* @property {number} minor - Unsigned 16-bit integer. Usually identifies the beacon within a set.
*/
/** This function is a parameter to startScan() and is called when a new device is discovered.
* @callback scanCallback
* @param {Beacon} beacon
*/
/** Describes an individual iBeacon
* @typedef {Object} Beacon
* @property {string} address - Uniquely identifies the device. Pass this to connect().
* The form of the address depends on the host platform.
* @property {number} rssi - A negative integer, the signal strength in decibels.
* @property {string} name - The device's name, or nil.
* @property {string} scanRecord - Base64-encoded binary data.
* @property {Region} region - Parsed from scanRecord.
* @property {number} txPower - RSSI at a distance of 1 meter, measured by the manufacturer. Parsed from scanRecord.
* @property {number} estimatedDistance - Calculated from rssi and txPower.
* @property {number} state - Connection state. See ble.connectionState.
* @property {number} _handle - Connection handle. Written by connect() and read by disconnect(). DO NOT MODIFY!
*/
/** This function is called when an operation fails.
* @callback failCallback
* @param {string} errorString - A human-readable string that describes the error that occurred.
*/
/** Stop scanning.
*/
stopScan: function() {
evothings.ble.stopScan();
},
calculateAccuracy: function(rssi, txPower) {
var ratio = rssi*1.0/txPower;
if (ratio < 1.0) {
return Math.pow(ratio,10);
} else {
return (0.89976)*Math.pow(ratio, 7.7095) + 0.111;
}
},
/** Connect to a beacon.
* <p>Will periodically update the device's RSSI and estimated distance, and report these values to the supplied callback.</p>
* <p>The callback will also be called when the connection state changes.
This is likely to happen often, as beacons move out of range, or back into range.</p>
* <p>When a connection is lost, the system will automatically try to reconnect, until you call disconnect().</p>
* @param {Beacon} beacon
* @param {connectCallback} win
* @param {failCallback} fail
*/
connect: function(beacon, win, fail) {
evothings.ble.connect(beacon.address, function(info) {
beacon.state = info.state;
beacon._handle = info.deviceHandle;
win(beacon);
function doRssi() {
evothings.ble.rssi(handle.deviceHandle, rssiHandler, fail);
}
function rssiHandler(rssi) {
beacon.rssi = rssi;
beacon.estimatedDistance = iBeacon.calculateAccuracy(beacon.rssi, beacon.txPower);
win(beacon);
setTimeout(doRssi, 1000);
}
doRssi();
}, fail);
},
/** This function is a parameter to connect() and is called when a beacon's values are updated.
* @callback connectCallback
* @param {Beacon} beacon - The same object that was passed to connect().
* beacon.state will have been updated, though it may have the same value as before anyway.
* If beacon.state == STATE_CONNECTED, beacon.rssi and beacon.estimatedDistance will have been updated.
*/
/** Stop the connection to a beacon.
* @param {Beacon} beacon
*/
disconnect: function(beacon) {
evothings.ble.close(beacon._handle);
},
};