The for(expression1;expression2;expression3) statement, any or all of the three expression can be omitted.
举一反三
- for (expression 1;; expression 3) can be understood as()
- Expression ~(9==1) is equal to the value of expression ~9==1.
- The value of expression ~(5|3) is not equal to the value of expression ~5|3.
- 在javascript中，下列哪段代码能够在1秒之后执行表达式？（ ） A: setTimeout(1000，expression) B: setTimeout(expression，1) C: setTimeout(1，expression) D: setTimeout(expression，1000)
- The expression products of all genes are proteins.