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function request(url, callback) {
    var xhr = new XMLHttpRequest();
    xhr.open('GET', url, true);
    xhr.responseType = 'json';
    xhr.onload = callback;
    xhr.send();
  }
  

// demo

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// Check
$(':checkbox').prop('checked', true);

// Un-check
$(':checkbox').prop('checked', false);

// Toggle
$(':checkbox').prop('checked', function (i, value) {
    return !value;
});

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<!-- add a perfect pixel layer [[ -->
    <div class="perfect-pixel" style="display:none;position: absolute; z-index: 2147483646; width: 100%; height: auto;  cursor: all-scroll; pointer-events: none; margin: 0 auto; margin-left: -50%; top: 0; left: 50%; min-width: 1190px; opacity: 0.3; background-color: transparent;">
        <img src="temp/index-1190x.jpg" alt="" style="position: relative; margin: 0 auto; padding: 0px; display: block; height: auto;">
    </div>
    <!-- add a perfect pixel layer ]] -->

leohxj

Apps whose displays tend to jump raggedly during animations, scrolling, or other user interaction suffer from a performance issue commonly called jank or judder. Jank is an annoying distraction for users; it interrupts the users' flow of thought and it makes the app look less polished and professional.

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#hack{
color:red; /* All browsers */
color:red !important;/* All browsers but IE6 */
_color:red; /* Only works in IE6 */
*color:red; /* IE6, IE7 */
+color:red;/* Only works in IE7*/
*+color:red; /* Only works in IE7 */
color:red\9; /* IE6, IE7, IE8, IE9 */
color:red\0; /* IE8, IE9 */
color:red\9\0;/*Only works in IE9*/

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function leftpad (str, len, ch) {
  str = String(str);

  var i = -1;

  if (!ch && ch !== 0) ch = ' ';

  len = len - str.length;

  while (++i < len) {

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c:>netstat -ano|findstr "8080"
c:>tasklist|findstr 3112

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div {
  width: 300px;
  overflow: hidden;
  white-space: nowrap;
  -ms-text-overflow: ellipsis;
  text-overflow: ellipsis;
}

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var supportPlaceHolder = function() {
    // first, detect the placeholder attribute
    var isPlaceholder = function(){
        var input = document.createElement('input');
        return 'placeholder' in input;
    }

    if(!isPlaceholder()){
        $('[placeholder]').each(function(){
            var defaultValue = $(this).attr("placeholder");

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// UC-U3内核JavaScript专用API
// （经测试，官方文档给出的API很多也不能使用，下面只列出测试能用的）
// 1. 关闭默认手势
// 用法：
navigator.control.gesture(false);
// 推荐写法：
try {
    navigator.control.gesture(false);
} catch (e) {
}