html2canvas

参考：

• http://www.elliottsprehn.com/preso/fluentconf/
• http://stackoverflow.com/questions/4912092/using-html5-canvas-javascript-to-take-screenshots

var json_text = JSON.stringify(your_object);

var your_object = JSON.parse(json_text);

参考：http://stackoverflow.com/questions/191881/serializing-to-json-in-jquery

为了保证参数值特殊字符被转义，应该使用encodeURIComponent编码URL参数值

var myOtherUrl = "http://example.com/index.html?url=" + encodeURIComponent(myUrl);

<!-- load jQuery 1.1.3 -->
<script type="text/javascript" src="http://example.com/jquery-1.1.3.js"></script>
<script type="text/javascript">
var jQuery_1_1_3 = $.noConflict(true);
</script>

<!-- load jQuery 1.3.2 -->
<script type="text/javascript" src="http://example.com/jquery-1.3.2.js"></script>
<script type="text/javascript">
var jQuery_1_3_2 = $.noConflict(true);
</script>

function numberWithCommas(x) {
    return x.toString().replace(/\B(?=(\d{3})+(?!\d))/g, ",");
}

function preload(arrayOfImages) {
    $(arrayOfImages).each(function(){
        $('<img/>')[0].src = this;
        // Alternatively you could use:
        // (new Image()).src = this;
    });
}

// 用法:

preload([
    'img/imageName.jpg',
    'img/anotherOne.jpg',
    'img/blahblahblah.jpg'
]);

或者使用jQuery的preload插件：

$.fn.preload = function() {
    this.each(function(){
        $('<img/>')[0].src = this;
    });
}

// 用法:

 

jQuery.isNumeric(value);

或

function isNumeric(obj) {
    return !jQuery.isArray( obj ) && (obj - parseFloat( obj ) + 1) >= 0;
}

 

if( /Android|webOS|iPhone|iPad|iPod|BlackBerry|IEMobile|Opera Mini/i.test(navigator.userAgent) ) {

// some code..

}

 

function shuffle(array) {
  var currentIndex = array.length, temporaryValue, randomIndex ;

  // While there remain elements to shuffle...
  while (0 !== currentIndex) {

    // Pick a remaining element...
    randomIndex = Math.floor(Math.random() * currentIndex);
    currentIndex -= 1;

    // And swap it with the current element.
    temporaryValue = array[currentIndex];
    array[currentIndex] = array[randomIndex];
    array[randomIndex] = temporaryValue;
  }

  return array;
}

 

$.getScript("my_lovely_script.js", function(){

   alert("Script loaded and executed.");

   // Use anything defined in the loaded script...
});

不使用jQuery的方法请参考：http://stackoverflow.com/questions/950087/include-a-javascript-file-in-another-javascript-file