数组的引用

        var arrA=[1,2,3,4];
        var arrB;
        arrB=arrA;//将arrA的引用赋值给arrB
        arrB[0]=‘aaa‘;
        console.log(‘arrA‘,arrA);//[‘aaa‘,2,3,4]
        console.log(‘arrB‘,arrB);//[‘aaa‘,2,3,4]

        var arrC=[1,2,3,4];
        var arrD;
        arrD=arrC.slice();//用slice()创建新数组,切断两个数组的联系
        arrD[0]=‘ccc‘;
        console.log(‘arrC‘,arrC);//[1,2,3,4]
        console.log(‘arrD‘,arrD);//[‘ccc‘,2,3,4]

        var arrE=[5,6,7,8];
        var arrF=[];
        arrF.push(arrE);//将arrE的引用push到arrF        
        console.log(‘arrF‘,arrF);//[[‘eee‘,6,7,8]]
        console.log(‘arrE‘,arrE);//[5,6,7,8]
        arrE[0]=‘eee‘;        
        console.log(‘arrF‘,arrF);//[[‘eee‘,6,7,8]]
        console.log(‘arrE‘,arrE);//[‘eee‘,6,7,8]