使用 reduce 和 reduceRight 方法可以汇总数组元素的值，具体用法如下：

reduce

function appendCurrent (previousValue, currentValue) {    return previousValue + "::" + currentValue;}var elements = ["abc", "def", 123, 456];var result = elements.reduce(appendCurrent);document.write(result); //abc::def::123::456

reduceRight

function appendCurrent (previousValue, currentValue) {    return previousValue + "::" + currentValue;}var elements = ["abc", "def", 123, 456];var result = elements.reduceRight(appendCurrent);document.write(result); //456::123::def::abc