给object数组进行排序（排序条件是每个元素对象的属性个数）

var arr = [10,6,0,4];
console.log( arr.sort() ); //按字符排序 0,10,4,6
console.log( arr.sort( function(a,b) { //指定排序方式  0,4,6,10
    return a - b;
} ) )

Object.getPropertyNames(obj).length

var person = { name:‘Schoolar‘, age:35, like:‘javascript‘ },
    cat = { name:‘kitty‘, food:‘fish‘ },
    car = { door:‘four‘ },
    objArray = [cat, car, person];
function sortObjectArray(objArray) {
    objArray.sort( function(a,b) {
        return Object.getOwnPropertyNames(a).length - Object.getOwnPropertyNames(b).length;
    } );
}
sortObjectArray( objArray );
objArray.forEach( function(obj) {
    console.log( obj );
} );