文本框选中部分值

function selectText(txt,sIndex,eIndex){
				if(txt.setSelectionRange){
					txt.setSelectionRange(sIndex,eIndex);
				}else if(txt.createTextRange){
					var range = txt.createTextRange();
					range.collapse(true);
					range.moveStart("character",sIndex)
					range.moveEnd("character",eIndex);
					range.select();
				}
			}