Log - js study notes

1. Performance analysis (test code running time)

//operation hours
console.time("timer"); //Before running
for(var i=0;i<10000;i++){}
console.timeEnd("timer");//After running

 

1. Convert strings to numbers

1.parseInt()和parseFloat()

parseFloat("123456789.5678980");

2. Unary addition operator ("+")

(+"1.1") + (+"1.1") = 2.2   // 注：加入括号为清楚起见，不是必需的。

To be continued. . . .