jQuery在textarea光标处插入文本

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/** * @param $ * 自定义jQuery扩展方法, 在光标处插入内容 */(function ($) {"use strict";    $.fn.extend({        insertAtCaret : function (myValue) {            var $t = $(this)[0];            if (document.selection) {                this.focus();                var sel = document.selection.createRange();                sel.text = myValue;                this.focus();            } else                if ($t.selectionStart || $t.selectionStart == '0') {                    var startPos = $t.selectionStart;                    var endPos = $t.selectionEnd;                    var scrollTop = $t.scrollTop;                    $t.value = $t.value.substring(0, startPos) + myValue + $t.value.substring(endPos, $t.value.length);                    this.focus();                    $t.selectionStart = startPos + myValue.length;                    $t.selectionEnd = startPos + myValue.length;                    $t.scrollTop = scrollTop;                } else {                    this.value += myValue;                    this.focus();                }        }    });})(jQuery);

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