JavaScript handler.get()用法及代碼示例

get:function(target, property, receiver)

var data = { 
  "a":11,"b":21 }
var get = new Proxy(
  data ,  {
  	get:function(y, idx) {
         return y[idx] * 2
         document.writeln("<br/>");
    }  
  }
)

for(var z in get) {
  document.write(z +":")
 document.write(get[z])
}

a:22b:42

var x = { f:45, g:23 };
var proxy = new Proxy(x, {
  get:function(target, name, proxy) {
    document.write('In get');
     
    var value = target[name];
    if (typeof value === 'string') {
      value = value.toUpperCase();
    }
    return value;
  }
});
document.write (proxy.f);
document.write (x.g);

In get4523

const r = {}
const  p = new Proxy(r, {
  get:function(target, property, receiver) {
   document.write('called:' + property);
    return 100;
  }
});
document.write(p. a);

called:a100