Code to test JavaScript string processing performance_javascript tips

Copy code The code is as follows:

var oldtime = new Date().getTime();
var str = [];
for(i=0;i<100000;i )
{
str.push('abcabcabcabcabcabcabcabcabcabcabcabc');
}
var newtime = new Date( ).getTime();
var joinTime = (newtime - oldtime);

var oldtime = new Date().getTime();
var str='';
for( i=0;i<100000;i )
{
str = 'abcabcabcabcabcabcabcabcabcabcabcabc';
}
var newtime = new Date().getTime();
var concatTime = (newtime - oldtime);

alert("join / concat: " (joinTime * 1.0 / concatTime));

Note: The number of loops must be large enough.