​x
 
<!DOCTYPE html>
<html>
<body>
​
<h1>使用 <em>replacer</em> 函数</h1>
​
<p>大写 "city" 的值：</p>
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<p id="demo"></p>
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<script>
var obj = { "name":"Bill", "age":"19", "city":"Seattle"};
var text = JSON.stringify(obj, function (key, value) {
  if (key == "city") {
    return value.toUpperCase();
  } else {
    return value;
  }
});
​
document.getElementById("demo").innerHTML = text; 
</script>
​
</body>
</html>
​