<script> angular.module("Stooges", []).        directive("autoResize", ["$interpolate", function ($interpolate) {            var calcTextarea; //缓存 calcTextarea 指针            var lastTeaxArea; //保留最后一次textarea的指针，for 验证要不要 copy paste comeputedStyle            function createCalcTextarea() {                var txa = document.createElement("textarea");                txa.style.cssText = "position:fixed; top:-9999px; left:0; overflow-y:hidden;";                document.body.appendChild(txa);                calcTextarea = txa                return calcTextarea;            }            function resizeTextarea($element, value) {                calcTextarea = (calcTextarea) ? calcTextarea : createCalcTextarea(); //没有就创建一个                                if (lastTeaxArea !== $element[0]) {                    //copy paste all style to calcTextarea                    var COPY_PASTE_COMPUTED_STYLE = [‘width‘, ‘border-top-width‘, ‘border-bottom-width‘, ‘border-left-width‘, ‘border-right-width‘, ‘padding-top‘, ‘padding-bottom‘, ‘padding-left‘, ‘padding-right‘, ‘line-height‘, ‘font-family‘, ‘font-size‘, ‘font-weight‘, ‘font-style‘, ‘resize‘, ‘letter-spacing‘, ‘text-transform‘, ‘word-spacing‘, ‘text-indent‘, ‘word-break‘, ‘word-wrap‘, ‘-webkit-box-sizing‘, ‘-moz-box-sizing‘, ‘box-sizing‘]                    lastTeaxArea = $element[0];                    var computedStyle = window.getComputedStyle($element[0], null);                    COPY_PASTE_COMPUTED_STYLE.forEach(function (attr) {                        var camelCaseWord = attr.toCamelCase();                        calcTextarea.style.setProperty(attr, computedStyle[camelCaseWord]); //用 setProperty 比较好(不然font处理不到)                    });                }                calcTextarea.value = value;                var currentHeight = calcTextarea.scrollHeight;                $element.css("height", currentHeight + 20 + "px");            }            return {                restrict: "A",                link: function (scope, $element, attrs, ctrl) {                    $element[0].style.cssText = "resize:none; overflow:hidden; -webkit-transition: 0.3s linear; transition: 0.3s linear;"; //set default css                    var is_watch = attrs["autoResize"] === "watch";                    var value =http://www.mamicode.com/ $interpolate($element.val())(scope);                    resizeTextarea($element, value);                    if (is_watch) {                        $element.on("keyup", function () {                            resizeTextarea($element, $element.val());                        });                    }                }            }        }]);    </script>