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function f(n) {
        return n < 10 ? '0' + n : n;
}

Date.prototype.toJSON = function () {
  return isFinite(this.valueOf())
      ? this.getUTCFullYear()     + '-' +
          f(this.getUTCMonth() + 1) + '-' +
          f(this.getUTCDate())      + 'T' +
          f(this.getUTCHours())     + ':' +

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function getElementLeft(elem) {
	var left = elem.offsetLeft,
		current = elem.offsetParent;

	while (current) {
		left += current.offsetLeft;
		current = current.offsetParent;
	}

	return left;

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var ruleRegex = /^(.+?)\[(.+)\]$/,
    numericRegex = /^[0-9]+$/,
    integerRegex = /^\-?[0-9]+$/,
    decimalRegex = /^\-?[0-9]*\.?[0-9]+$/,
    emailRegex = /^[a-zA-Z0-9.!#$%&'*+\-\/=?\^_`{|}~\-]+@[a-zA-Z0-9\-]+(?:\.[a-zA-Z0-9\-]+)*$/,
    alphaRegex = /^[a-z]+$/i,
    alphaNumericRegex = /^[a-z0-9]+$/i,
    alphaDashRegex = /^[a-z0-9_\-]+$/i,
    naturalRegex = /^[0-9]+$/i,
    naturalNoZeroRegex = /^[1-9][0-9]*$/i,

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JSON.parse(JSON.stringify(obj));

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function contains(parentNode, childNode) {
    if (parentNode.contains) {
        return parentNode != childNode && parentNode.contains(childNode);
    } else {
        return !!(parentNode.compareDocumentPosition(childNode) & 16);
    }
}

/*

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webkitProperty
MozProperty
msProperty
OProperty
property

myself.style.webkitTransform = "";
myself.style.MozTransform = "";
myself.style.msTransform = "";
myself.style.OTransform = "";

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var jsonStr = '{"name": "w3help", "url": "www.w3help.org", "tech": ["js", "HTML", "CSS", 5, 4.01, 2.1],'
          + '"online": true, "category": {"RCA": "Root Cause Artical", "KB":"Knowledge Base"},'
          + '"version": 1}';
     
json2 = (new Function("return " + jsonStr))();

for(p in json2) {
    alert(json2[p]);
}

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webkit：
主要有下面7个属性

::-webkit-scrollbar 滚动条整体部分，可以设置宽度

::-webkit-scrollbar-button 滚动条两端的按钮

::-webkit-scrollbar-track  外层轨道

::-webkit-scrollbar-track-piece  内层滚动槽

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if (!String.prototype.trim) {
    String.prototype.trim = function() {
        return this.replace(/^\s+/, "").replace(/\s+$/, "");
    };
}

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var script = document.createElement("script");
     
if (script.readyState) {
    script.onreadystatechange = function() {
        if (script.readyState == "loaded" || script.readyState == "complete") {
            script.onreadystatechange = null;
            alert("ie");
        }
    }
} else {