Function? SortFun (props? ,? rev){
//Sort by attribute, and decide ascending or descending order according to Rev.
If (rev? ===? Undefined) {
rev？ = 1;
} something else? {
rev？ =(rev)？ 1? :? - 1;
}
Return? Function? (a，b){
Jean? val 1？ =? A [prop];
Jean? val2？ =? b[prop]；
if(val 1？ & lt？ val2){
Return? rev？ *? - 1;
}
if(val 1？ & gt？ val2){
Return? rev？ *? 1;
}
Return? 0;
}
}
Function? clickFun()？ {
var？ First grade? =? {
Class one:? ['language core',? Yang Wenli? Geng Yu Zhen',? Can HTC',? Sophora japonica'],
Class two:? 【' Ji Jiayun',? Bai Qiu'? Dai Yong e? Liao junfeng],
Class 3:? ['Ji Jingying',? Xia Han' Murong Tianqing' Shi Hongwen'? Sui Yueyong'? Laurel's clothes? Yan Yuhua']
};
var？ For example? =[];
//instanceof？ rank
for(var？ Keys? Are you online? Grade one) {
var？ arr？ =? First grade [emphasis];
If (? arr？ instanceof？ Array? ) {//Determines whether the value of this property is an array.
example.push({"key ":？ The key? " len ":？ arr.length})。 //Put it in the example to facilitate sorting later.
}
}
//Call the sort method to sort.
example.sort(sortFun('len '，？ false))； //false is descending.
debugger
Console.log (example [0]). Key); //in descending order, so the first one is the most.
}