Appreciation of Javascript quatrains, some classic js codes_javascript skills

1. Round and convert to numeric type:
'10.567890′|0
Result: 10
'10.567890′^0
Result: 10
-2.23456789|0
Result: -2
~~-2.23456789
Result: -2
2. Convert date to value:
var d = new Date(); //1295698416792
3. Convert array-like object to array:
var arr = [].slice.call(arguments)
4. Beautiful random code:
Math.random().toString(16).substring(2); //14 bits
Math.random().toString(36).substring(2); //11 digits
5. Merge arrays:
var a = [1,2,3];
var b = [ 4,5,6];
Array.prototype.push.apply(a, b);
uneval(a); //[1,2,3,4,5,6]
6 . Complete the digits with 0:
function prefixInteger(num, length) {
return (num / Math.pow(10, length)).toFixed(length).substr(2);
}
7. Swap values:
a= [b, b=a][0];
8. Insert one array into another array at the specified position:
var a = [1,2 ,3,7,8,9];
var b = [4,5,6];
var insertIndex = 3;
a.splice.apply(a, Array.concat(insertIndex, 0 , b));
// a: 1,2,3,4,5,6,7,8,9
9. Delete array elements:
var a = [1,2,3 ,4,5];
a.splice(3,1);
10. Quickly get the maximum and minimum value of an array
Math.max.apply(Math, [1,2,3]) / /3
Math.min.apply(Math, [1,2,3]) //1
(from http://ejohn.org/blog/fast-javascript-maxmin/)
11 . Conditional judgment:
var a = b && 1;
is equivalent to
if (b) {
a = 1
}
var a = b || 1;
Equivalent to
if (b) {
a = b;
} else {
a = 1;
}
12. Determine IE:
var ie = / *@cc_on !@*/false;
Any more? Welcome to respond