jQuery.support的实现方式

     jQuery.support 用于检查浏览器对各项特性的支持。检查项多达 27 个。
     首先，让我们用一段代码测试一下 support 中包含的检查项：

<script src='jquery.js'></script>
<script>
support = $.support;
for (key in support) {
    document.write('support.' + key + ' = ' + support[key] + '<br />');
}
</script>

IE 下的输出结果为：

support.leadingWhitespace = false
support.tbody = false
support.htmlSerialize = false
support.style = false
support.hrefNormalized = false
support.opacity = false
support.cssFloat = false
support.checkOn = true
support.optSelected = false
support.getSetAttribute = false
support.submitBubbles = false
support.changeBubbles = false
support.focusinBubbles = true
support.deleteExpando = false
support.noCloneEvent = false
support.inlineBlockNeedsLayout = false
support.shrinkWrapBlocks = true坏帐
support.reliableMarginRight = true
support.noCloneChecked = false
support.optDisabled = true
support.radioValue = false
support.checkClone = undefined
support.appendChecked = false
support.boxModel = false
support.reliableHiddenOffsets = false
support.ajax = true
support.cors = false

FireFox 中的显示结果为：

support.leadingWhitespace = true
support.tbody = true
support.htmlSerialize = true
support.style = true
support.hrefNormalized = true
support.opacity = true
support.cssFloat = true
support.checkOn = true
support.optSelected = true
support.getSetAttribute = true
support.submitBubbles = true
support.changeBubbles = true
support.focusinBubbles = false
support.deleteExpando = true
support.noCloneEvent = true
support.inlineBlockNeedsLayout = false
support.shrinkWrapBlocks = false
support.reliableMarginRight = true
support.noCloneChecked = true
support.optDisabled = true
support.radioValue = true淘宝女装夏装新款
support.checkClone = undefined
support.appendChecked = true
support.boxModel = true
support.reliableHiddenOffsets = true
support.ajax = true
support.cors = true