源代码：
<html>
<script>
var handler = {
get: function(target, name) {
debugger;
console.log("proxy handler called, context: " + target + " proxy name: " + name);
for( var pr in target){
console.log("property: " + pr + " native? " + target.hasOwnProperty(pr));
}
return name in target ?
target[name]:
37;
}
};
var p = new Proxy({ac: "Jerry"}, handler);
p.a = 1;
p.b = undefined;
console.log(p.a, p.b); // 1, undefined
console.log('c' in p, p.c); // false, 37
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