facePrint.js
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// Just for temporarily mobile debug.
(function () {
var infoDom;
var msgs = [];
var count = 0;
window.facePrint = function (msg, printObj) {
if (!infoDom) {
infoDom = createInfoDom();
}
if (printObj && isObject(msg)) {
msg = window.facePrint.objToStr(msg);
}
msgs.push(encodeHTML(msg));
count++;
if (msgs.length > 30) {
msgs.shift();
}
var str = '';
// Make some change in view, otherwise user may
// be not aware that log is still printing.
for (var i = 0; i < msgs.length; i++) {
str += msgs[i] + ' ' + (count - msgs.length + i) + ' ';
}
infoDom.innerHTML = str;
};
window.facePrint.objToStr = function (obj) {
var msgArr = [];
for (var key in obj) {
msgArr.push(key + '=' + obj[key]);
}
return msgArr.join(', ');
};
function createInfoDom() {
var dom = document.createElement('div');
dom.style.cssText = [
'position: fixed;',
'top: 0;',
'width: 100%;',
'border: 1px solid red;',
'height: 20px;',
'line-height: 20px;',
'z-index: 2147483647'
].join('');
document.body.appendChild(dom);
return dom;
}
function encodeHTML(source) {
return source == null
? ''
: String(source)
.replace(/&/g, '&')
.replace(/</g, '<')
.replace(/>/g, '>')
.replace(/"/g, '"')
.replace(/'/g, ''');
}
function isObject(value) {
// Avoid a V8 JIT bug in Chrome 19-20.
// See https://code.google.com/p/v8/issues/detail?id=2291 for more details.
var type = typeof value;
return type === 'function' || (!!value && type == 'object');
}
})();