//判断是否具有相应属性

        testProps: function (props) {

            var i;

            for (i in props) {

                if (document.createElement('modernizr').style[props[i]] !== undefined) {

                    return true;

                }

            }

            return false;

        },

        //判断浏览器

        testPrefix: function () {

            var prefixes = ['Webkit', 'Moz', 'O', 'ms'],

                p;

            for (p in prefixes) {

                if (this.testProps([prefixes[p] + 'Transform'])) {

                    return '-' + prefixes[p].toLowerCase();

                }

            }

            return '';

        },