如果这是一个字符串，那么解析它...

var str = '{"friendCount":5,"pnCount":0,"allCount":5}';
var obj = JSON.parse(str);
console.log(obj.friendCount, obj.pnCount, obj.allCount);

如果它已经是一个对象，就引用它

var obj = {"friendCount":5,"pnCount":0,"allCount":5};
console.log(obj.friendCount, obj.pnCount, obj.allCount);

试试这个

var data= {"friendCount":5,"pnCount":0,"allCount":5}

var friendCount = data.friendCount;
var pnCount = data.pnCount;
var allCount = data.allCount;

如果你想要Regex，它可以像this一样完成：

var re = /([\w]+)":(\d+)/g; 
var str = '"friendCount":5,"pnCount":0,"allCount":5';
var m;

while ((m = re.exec(str)) !== null) {
    if (m.index === re.lastIndex) {
        re.lastIndex++;
}
// View your result using the m-variable.
// eg m[0] etc.

}