js的this对象相关

 1 var scope = ‘globe‘
 2 function log() {
 3     // console.log(this)
 4     let arg  = Array.prototype.join.call(arguments, ‘, ‘);
 5     console.log(`${this.scope}: ${arg}`);
 6 }
 7 let obj = {
 8     scope: ‘own‘,
 9     lop: function() {
10         let scope = ‘scope‘;
11         log(‘low‘)
12     }
13 }
14 obj.lop(); // globe: low
15 obj.lop.call(obj); // globe: low
16 log.call(obj, ‘create‘) // own: create