对象属性检测和枚举

var obj = {
    name: 'u14e'
};

function checkProp(obj, prop) {
    return prop in obj && obj.hasOwnProperty(prop);
}

checkProp(obj, 'name');

var obj = {
    name: 'u14e'
};
var properties = Object.keys(obj);
for (var i = 0; i < properties.length; i++) {
    console.log('name: ' + properties[i]);
    console.log('value: ' + obj[properties[i]]);
}