Test results of string Truncation in various browsers

In JavaScript how to intercept strings, I only listed these methods. I tested them in three mainstream modern browsers. The results are shown in the following table:

Browser	Method	Test result 1	Test result 2
IE 8	Regular 1	469	468
	Regular 2	422	438
	Slice	94	94
	Substring	125	140
Chrome 4.0.295	Regular 1	44	43
	Regular 2	37	37
	Slice	11	12
	Substring	10	11
FF 1, 3.6	Regular 1	144	142
	Regular 2	122	126
	Slice	10	9
	Substring	12	11

Note: Regular 1 is match (/. * (. {2})/) [1], regular 2 is match (/. {2} $ /).

The test code refers to "Efficiency of String concatenation" and "test comparison of three JSON methods". From the simple test results, we can see that, slice () is recommended for string truncation ().