练习

对于下面的表单：

<form id="test-form" action="#0" onsubmit="return false;">

<p><label>Name: <input name="name"></label></p>

<p><label>Email: <input name="email"></label></p>

<p><label>Password: <input name="password" type="password"></label></p>

<p>Gender: <label><input name="gender" type="radio" value="m" checked> Male</label> <label><input name="gender" type="radio" value="f"> Female</label></p>

<p><label>City: <select name="city">

<option value="BJ" selected>Beijing</option>

<option value="SH">Shanghai</option>

<option value="CD">Chengdu</option>

<option value="XM">Xiamen</option>

</select></label></p>

<p><button type="submit">Submit</button></p>

</form>

输入值后，用jQuery获取表单的JSON字符串，key和value分别对应每个输入的name和相应的value，例如： {"name":"Michael","email":…}

'use strict';

var json = null;



json = ???;



// 显示结果:

if (typeof(json) === 'string') {

alert(json);

}

else {

alert('json变量不是string!');

}