jquery获取(设置)文本框(块)内光标位置插件v2

全冠清

/** * @author 全冠清 */$.fn.extend({position:function( value ){var elem = this[0];if (elem&&(elem.tagName=="TEXTAREA"||elem.type.toLowerCase()=="text")) {   if($.browser.msie){   var rng;   if(elem.tagName == "TEXTAREA"){     rng = elem.createTextRange();   }else{     rng = document.selection.createRange();   }   if( value === undefined ){    rng.moveStart("character",-elem.value.length);     return  rng.text.length;   }else if(typeof value === "number" ){    var index=this.position();  rng.moveStart("character",value)   rng.moveEnd("character",value-index+1) rng.select();   }}else{if( value === undefined ){    return elem.selectionStart;   }else if(typeof value === "number" ){    elem.selectionEnd = value;                elem.selectionStart = value;   }}}else{if( value === undefined )   return undefined;}}})