实现打字机打字的效果
(function(a) {a.fn.typewriter = function() {this.each(function() {var d = a(this),c = d.html(),b = 0;d.html("");var e = setInterval(function() {var f = c.substr(b, 1);if (f == "<") {b = c.indexOf(">", b) + 1} else {b++}d.html(c.substring(0, b) + (b & 1 ? "_": ""));if (b >= c.length) {clearInterval(e)}},75)});return this}})(jQuery);
?转，不是原创用来学习
