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                ~~~js function(a, b, ...theArgs) { // ... } ~~~ 如果函數的最后一個命名參數以`...`為前綴,則它將成為一個由剩余參數組成的真數組,其中從`0`(包括)到`theArgs.length`(排除)的元素由傳遞給函數的實際參數提供。 ### 剩余參數和?`arguments`對象的區別 剩余參數和?arguments對象之間的區別主要有三個: * 剩余參數只包含那些沒有對應形參的實參,而`arguments`對象包含了傳給函數的所有實參。 * `arguments`對象不是一個真正的數組,而剩余參數是真正的?Array實例,也就是說你能夠在它上面直接使用所有的數組方法,比如sort,map,forEach,pop * `arguments`對象還有一些附加的屬性?(如`callee`屬性)。 ### 從 arguments?到數組 ~~~ // Before rest parameters, "arguments" could be converted to a normal array using: function f(a, b) { var normalArray = Array.prototype.slice.call(arguments); // -- or -- var normalArray = [].slice.call(arguments); // -- or -- var normalArray = Array.from(arguments); var first = normalArray.shift(); // OK, gives the first argument var first = arguments.shift(); // ERROR (arguments is not a normal array) } // Now we can easily gain access to a normal array using a rest parameter function f(...args) { var normalArray = args; var first = normalArray.shift(); // OK, gives the first argument } ~~~
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