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                            ## 獲得每個月1號是星期幾？
~~~
var getWeek = function (year, month) {
    //1.根據年度和月份，創建日期
    //應該先對year,month進行整數及范圍校驗的。
    var d = new Date();
    d.setYear(year);
    d.setMonth(month - 1);
    d.setDate(1);
    console.log(d);
    //獲得周幾
    var weeks = ['周天', '周1', '周2', '周3', '周4', '周5', '周6'];
    return weeks[d.getDay()];
}

alert(getWeek(2019, 2));
~~~
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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