点点滴滴(JavaScript)

禁止选择
    unselectable="on"(off): IE/Opera
    style="-moz-user-select:none": FireFox(JS:element.style.MozUserSelect = "none";)
    style="-khtml-user-select:none": Safari(JS:element.style.KhtmlUserSelect)
    onselectstart="return false": IE
取消选择
    if(document.selection && document.selection.clear) document.selection.clear(); // IE
    else if(window.getSelection && window.getSelection().removeAllRanges) window.getSelection().removeAllRanges(); // FireFox/Opera/Safari
当前焦点是哪个控件
    document.activeElement // IE, FF3.0+
获取样式的实际属性值
    IE: 对象.currentStyle.需要访问的属性
    W3C: window.getComputedStyle("对象",null).需要访问的属性(第2个参数为伪元素,如:hover,:first-letter,:before等,是必须的)
    function getStyle(element, style){
        var strValue = "";
        if(document.defaultView && document.defaultView.getComputedStyle){
            strValue = document.defaultView.getComputedStyle(element, "").getPropertyValue(strCssRule);
        }
        else if(element.currentStyle){
            strCssRule = strCssRule.replace(/\-(\w)/g, function (strMatch, p1){
                return p1.toUpperCase();
            });
            strValue = element.currentStyle[strCssRule];
        }
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