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1ÅжÏselectÑ¡ÏîÖÐ ÊÇ·ñ´æÔÚValue="paraValue"µÄItem
2ÏòselectÑ¡ÏîÖÐ ¼ÓÈëÒ»¸öItem
3´ÓselectÑ¡ÏîÖРɾ³ýÒ»¸öItem
4ɾ³ýselectÖÐÑ¡ÖеÄÏî
5ÐÞ¸ÄselectÑ¡ÏîÖÐ value="paraValue"µÄtextΪ"paraText"
6ÉèÖÃselectÖÐtext="paraText"µÄµÚÒ»¸öItemΪѡÖÐ
7ÉèÖÃselectÖÐvalue="paraValue"µÄItemΪѡÖÐ
8µÃµ½selectµÄµ±Ç°Ñ¡ÖÐÏîµÄvalue
9µÃµ½selectµÄµ±Ç°Ñ¡ÖÐÏîµÄtext
10µÃµ½selectµÄµ±Ç°Ñ¡ÖÐÏîµÄIndex
11Çå¿ÕselectµÄÏî
// 1.ÅжÏselectÑ¡ÏîÖÐ ÊÇ·ñ´æÔÚValue="paraValue"µÄItem       
function jsSelectIsExitItem(objSelect, objItemValue) {       
    var isExit = false;       
    for (var i = 0; i < objSelect.options.length; i++) {       
        if (objSelect.options.value == objItemValue) {       
            isExit = true;       
            break;       
        }       
    }       
    return isExit;       
}       
// 2.ÏòselectÑ¡ÏîÖÐ ¼ÓÈëÒ»¸öItem       
function jsAddItemToSelect(objSelect, objItemText, objItemValue) {       
    //ÅжÏÊÇ·ñ´æÔÚ       
    if (jsSelectIsExitItem(objSelect, objItemValue)) {       
        alert("¸ÃItemµÄValueÖµÒѾ­´æÔÚ");       
    } else {  


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