例子：
function compare(value1,value2){
if(value1<value2){
return -1;
}else if(value1==value2){
return 0;
}else{
return 1；
}
}
var arr = [1,12,4,5,23];
conaole.log(arr.sort()) // 1,12,23,4,5
console.log(arr.sort(complate)) //1,4,5,12,23原文：http://www.cnblogs.com/madada111/p/6396994.html