一个问题，字符串类型和数字类型能相加？

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#1 Created at ... [Delete] [Delete and Lock User]

var age = 20; var message = '你好, ' + name + ', 你今年' + age + '岁了!';

age是数字类型，这怎么相加的，js可以这么干？

#2 Created at ... [Delete] [Delete and Lock User]

非字符串类型和字符串相加前自动转换为字符串

js能干的事情太多了

var n = ~~'123'; // 不要这么写

#3 Created at ... [Delete] [Delete and Lock User]

js会自己改变数据类型。

#4 Created at ... [Delete] [Delete and Lock User]

java也是可以的,这种用法很常见.