javascript设置input编辑框光标的位置

function set_text_value_position(obj, spos){var tobj = document.getElementById(obj);if(spos<0)spos = tobj.value.length;if(tobj.setSelectionRange){ //兼容火狐,谷歌setTimeout(function(){tobj.setSelectionRange(spos, spos);tobj.focus();},0);}else if(tobj.createTextRange){ //兼容IEvar rng = tobj.createTextRange();rng.move('character', spos);rng.select();}}//调用演示set_text_value_position('login_div', -1);  //设置到末尾set_text_value_position('login_div', 0); //设置到开头