function supportCss3(style) {

    var prefix = ['webkit', 'Moz', 'ms', 'o'],

        i,

        humpString = [],

        htmlStyle = document.documentElement.style,

        _toHumb = function (string) {

            return string.replace(/-(\w)/g, function ($0, $1) {

                return $1.toUpperCase();

            });

        }; 

    for (i in prefix){

        humpString.push(_toHumb(prefix[i] + '-' + style));

    }

    humpString.push(_toHumb(style)); 

    for (i in humpString){

        if (humpString[i] in htmlStyle) return true;

    }

    return false;

}

//调用：

alert(supportCss3('transition'));