一、遍历对象（不包含继承属性）
var obj = {'a':'a','b':'b','c':'c'};
Object.keys(obj).forEach(function(key){
console.log(key,":",obj[key]);
});
Object.getOwnPropertyNames(obj).forEach(function(key){
console.log(key,":",obj[key]);
});
Reflect.ownKeys(obj).forEach(function(key){
console.log(key,":",obj[key]);
});
二、遍历数组
forEach
var arr=[1,2,3,4];
arr.forEach(function(val, index) {
console.log(index, ":",val);
});
for in
var arr=["张三","李四","王五","赵六"];
for (var index in arr){
console.log(index,":",arr[index]);
}
