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join( )括号中不加任何参数,默认是逗号连接
var arr = ['aa','bb','cc','dd'];
alert(arr.join());//aa,bb,cc,dd
join( )括号中加单引号,连接:
alert(arr.join(''));//aabbccdd
jion( ) 括号中添加分隔符:
alert(arr.join('-'));//aa-bb-cc-dd