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Array.prototype.bubbleSort = function() {
let len = this.length
for (let j=1; j<len; j++) {
for (let i=0; i<len-j; i++) {
// 开始比较，如果第一个数大于第二个数就进行交换，这样大的就到后面去了
if (this[i] > this[i+1]) {
let tempnum = this[i+1]
this[i+1] = this[i]
this[i] = tempnum
}
}
}
}
let arr = [2,9,5,7,1,1,6,3,3,4]
console.log("原来：", arr.toString())
// 原来： 2,9,5,7,1,1,6,3,3,4
arr.bubbleSort()
console.log("排序后：", arr.toString())
// 排序后： 1,1,2,3,3,4,5,6,7,9
