function jsSelectIsExitItem(d,c){var b=false;for(var a=0;a<d.options.length;a++){if(d.options[a].value==c){b=true;break}}return b}function jsAddItemToSelect(d,b,c){if(jsSelectIsExitItem(d,c)){}else{var a=new Option(b,c);d.options.add(a)}}function jsRemoveItemFromSelect(c,b){if(jsSelectIsExitItem(c,b)){for(var a=0;a<c.options.length;a++){if(c.options[a].value==b){c.removeChild(c.options[a]);break}}}else{}}function jsUpdateItemToSelect(d,b,c){if(jsSelectIsExitItem(d,c)){for(var a=0;a<d.options.length;a++){if(d.options[a].value==c){d.options[a].text=b;break}}alert("成功修改")}else{alert("该select中 不存在该项")}}function jsSelectItemByValue(d,c){var b=false;for(var a=0;a<d.options.length;a++){if(d.options[a].text==c){d.options[a].selected=true;b=true;break}}if(b){alert("成功选中")}else{alert("该select中 不存在该项")}};