Definition and Usage
定义与用法

The toUpperCase() method is used to display a string in uppercase letters.
toUpperCase()方法用于将字母转换为大写

Syntax
语法

stringObject.toUpperCase()

Example
实例

In this example "Hello world!" will be displayed in upper case letters:
在本例中"Hello world!"将被转换成大写字母输出：

<script type="text/javascript">

var str="Hello world!"
document.write(str.toUpperCase())

</script>

Try-It-Yourself Demos
互动演练

toUpperCase()
How to use toUpperCase() to display a string in upper case letters.
如何用toUpperCase()将字母转换为大写

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