jq-supper功能检测

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

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support.checkOn=true 兼容性问题?
support.optSelected=true 下拉菜单? 检测默认值是否选中? 检查第一个option?
support.reliableMarginRight=true 检查marginRight计算是否可靠? 
support.boxSizingReliable=true
support.pixelPosition=false
support.noCloneChecked=true
support.optDisabled=true
support.radioValue=true
support.checkClone=true
support.focusinBubbles=false
support.clearCloneStyle=true
support.cors=true
support.ajax=true