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The substring() method extracts the characters in a string between two specified indices.
substring()方法用于取出字符串中特定位置间的字符
stringObject.substring(start,stop) |
Parameter 参数 | Description 注释 |
---|---|
start 开始位置 | Required. Where to start the extraction. Must be a numeric value 必选项。开始选取的位置。必须为数字。 |
stop 停止 | Optional. Where to stop the extraction. Must be a numeric value 可选项。停止选取的位置。必须为数字。 |
Note: To extract characters from the end of the string, use a negative start number.
注意:要从字符的尾部开始取字符,用负数做为起始字符。
Note: The start index starts at 0.
注意:第一个字符的位置为0
Note: If the stop parameter is omitted, this method extracts to the end of the string.
注意:如果为指定结束位置,默认将选取到字符串结束。
In this example we will use substring() to extract some characters from a string:
在本例中,我们将演示substring()从字符串中选取一些字符:
<script type="text/javascript"> var str="Hello world!" </script> |
The output of the code above will be:
输出结果为:
lo world! |
In this example we will use substring() to extract some characters from a string:
在本例中,我们将用substring()从字符串中选取一些字符:
<script type="text/javascript"> var str="Hello world!" </script> |
The output of the code above will be:
输出结果为:
lo w |
substring()
How to use substring() to extract some characters from a string.
如何用substring()从字符串中选取一些字符