删除第5个字符之后的字符串的所有字符？

Question

I need to remove all characters of a string after 5th character, for example

my string is

P-CI-7-C-71

and the output should be like

P-CI-

Answer 1

Use substring

alert("P-CI-7-C-71".substring(0, 5)); 

So you can use it like

var str='P-CI-7-C-71'.substring(0, 5); 

You can also use substr , that will work the same in this case but remember they work differently so they are not generally interchangeable

var str='P-CI-7-C-71'.substr(0, 5); 

Difference can be noticed in the prototype

str.substring(indexStart[, indexEnd])

VS

str.substr(start[, length])

Answer 2

Extracting String Parts

There are 3 methods for extracting a part of a string:

slice(start, end)
substring(start, end)
substr(start, length)

Answer 3

With String#substring :

The substring() method returns a subset of a string between one index and another, or through the end of the string.

 document.write('P-CI-7-C-71'.substring(0, 5)); 

Answer 4

Try this:

 alert('P-CI-7-C-71'.substring(0,5)); 

 var str = 'P-CI-7-C-71'; var res = str.slice(0,5); alert(res); 

Answer 5

Use Can use substring function in the JS

the Substring(StringName,StartPosition, End Position);