js view the execution time of a function example code_javascript skills

js View the execution time of a function example code_javascript skills

Not much to say in detail, please see the code example explanation below

There is a summation as follows function, we need to know the time it takes to execute this function

function add(){

 var sum = 0 ;

 for(var i = 0;i<1000000;i++){

  sum += i;

 }

return sum;

}

Define a test function and pass the function under test as a parameter

function test(func){

 var start = new Date().getTime();//起始时间

 func();//执行待测函数

 var end = new Date().getTime();//接受时间

 return (end - start)+"ms";//返回函数执行需要时间

}

Test and view the actual execution time

var time = test(add);

console.log(time);

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