字符串链接join( )

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

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