计算对象的长度,即获取对象属性的个数
var obj = {"c1":1,"c2":2};
function countProperties(obj){
for(var property in obj){
if(Object.prototype.hasOwnProperty.call(obj,property){
count++;
})
}
return count;
}
var len = obj.length;
console.log(len);//结果为2
1 var obj = {"c1":1,"c2":2};
2 var arr = Object.keys(obj);
3 var len = arr.length;
4 console.log(len);//结果为2