为了将键/值对添加到JSON对象，我们使用点表示法或方括号表示法。这两种方法都被广泛接受，下面通过示例来了解一下。
示例1：使用点表示法将{"prop_4" : "val_4"}添加到JSON对象中
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
</head>
<body>
<h2 style="color:green;">如何将元素添加到JSON对象？</h2>
<p id="up" style=" font-weight: bold"></p>
<button onclick="fun()">单击以添加</button>
<p id="down" style="color:green; font-weight: bold" ;></p>
<script>
var demo = {
prop_1: "val_1",
prop_2: "val_2",
prop_3: "val_3"
};
var p_up =
document.getElementById("up");
var p_down =
document.getElementById("down");
p_up.innerHTML =
JSON.stringify(demo);
function fun() {
demo.prop_4 = "val_4";
p_down.innerHTML = JSON.stringify(demo);
}
</script>
</body>
</html>示例2：使用方括号表示法将{"prop_4" : "val_4"}添加到JSON对象中。
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
</head>
<body>
<h2 style="color:green;">如何将元素添加到JSON对象？</h2>
<p id="up" style=" font-weight: bold"></p>
<button onclick="fun()">单击以添加</button>
<p id="down" style="color:green; font-weight: bold" ;></p>
<script>
var demo = {
prop_1: "val_1",
prop_2: "val_2",
prop_3: "val_3"
};
var p_up =
document.getElementById("up");
var p_down =
document.getElementById("down");
p_up.innerHTML = JSON.stringify(demo);
function fun() {
demo["prop_4"] = "val_4";
p_down.innerHTML = JSON.stringify(demo);
}
</script>
</body>
</html> 
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