ES6中數組首尾兩端和中間添加/移除數據方法

一、push() 尾端插入，返回數組長度javascript let arr = [1,"hello",true]; console.log(arr.push(22));//4 console.log(arr,'---arr');//[1, "hello", true, 22] console.log(arr.push(false,123));//6 console.log(arr,'---arr

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