Definition and Usage
定义与用法

The toLowerCase() method is used to display a string in lowercase letters.
toLowerCase()方法用于将字母转换为小写

Syntax
语法

stringObject.toLowerCase()

Example
实例

In this example "Hello world!" will be displayed in lower case letters:
在本例中，"Hello World!"将被转为小写字母输出:

<script type="text/javascript">

var str="Hello World!"
document.write(str.toLowerCase())

</script>

Try-It-Yourself Demos
互动演练

toLowerCase()
How to use toLowerCase() to display a string in lower case letters.
如何用toLowerCase()来将字母转为小写

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