Analysis of how JavaScript dynamically sets the selected Option in Select

How JavaScript dynamically sets the selected instance analysis of Option in Select

var select = document.getElementById("selectYear");  
var nextYear = '2012';  
for(var i=0; i<select.options.length; i++){  
    if(select.options[i].innerHTML == nextYear){  
        select.options[i].selected = true;  
        break;  
    }  
}

/** 
 * 设置select选中 
 * @param selectId select的id值 
 * @param checkValue 选中option的值 
 * @author lqy 
 * @since 2015-08-21 
*/  
function setSelectChecked(selectId, checkValue){  
    var select = document.getElementById(selectId);  
    for(var i=0; i<select.options.length; i++){  
        if(select.options[i].innerHTML == checkValue){  
            select.options[i].selected = true;  
            break;  
        }  
    }  
};

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