选中文本

function setSelectRange(){
var inputDom = $(".input");
if(inputDom && inputDom[0]){
var pos = inputDom[0].selectionStart;
switch(pos){
case 0:
case 1:
case 2:
inputDom[0].setSelectionRange(0,2);
break;
default:
inputDom[0].setSelectionRange(3,5);
break;
}
}
}