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                ### push unshift concat ~~~ <script> /* 增加-->都會改變數組 1.push從后增加 push(para1,para2) 2.unshift從頭增加 unshift(para1,para2) */ /* concat(para1,para2) contcat([para1,para2]) 不會改變數組的內容 */ var arr = [1,2,3,4]; // arr.push(5,6); // arr.unshift(-1,0); var n = arr.concat([7,8]) console.log(arr); console.log(n); </script> ~~~ concat(value|[arr]) 本方法可以傳單個值,也可以傳數組 ~~~ var arr = [1,2,3]; var b = arr.concat(4); console.log(arr); //1,2,3 console.log(b); //1,2,3,4 eg:復制數組 var arr=[1,2,3]; var b =[].concat(arr); console.log(b); //1,2,3 ~~~
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