jQuery 输入框 在光标位置插入内容, 并选中

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// //使用方法 //$(文本域选择器).insertContent("插入的内容"); //$(文本域选择器).insertContent("插入的内容"，数值); //根据数值选中插入文本内容两边的边界, 数值: 0是表示插入文字全部选择，-1表示插入文字两边各少选中一个字符。 // //在光标位置插入内容, 并选中 (function($) {     $.fn.extend({         insertContent: function(myValue, t) {             var $t = $(this)[0];             if (document.selection) { //ie                 this.focus();                 var sel = document.selection.createRange();                 sel.text = myValue;                 this.focus();                 sel.moveStart('character', -l);                 var wee = sel.text.length;                 if (arguments.length == 2) {                     var l = $t.value.length;                     sel.moveEnd("character", wee + t);                     t <= 0 ? sel.moveStart("character", wee - 2 * t - myValue.length) : sel.moveStart("character", wee - t - myValue.length);                        sel.select();                 }             } else if ($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;                 if (arguments.length == 2) {                     $t.setSelectionRange(startPos - t, $t.selectionEnd + t);                     this.focus();                 }             }             else {                 this.value += myValue;                 this.focus();             }         }     }) })(jQuery);