, G Z5 O( S' Q; Z6 h 5. console.time()和console.timeEnd() 9 c. f3 u! ]/ u0 \1 {0 N无论何时我们想知道一段代码或一个函数所需要花费的时间,都可以使用JavaScript控制台对象提供的time()和timeEnd()方法。关键是要有一个必须相同的标签,而里面的代码可以是任何东西(函数、对象、甚至直接console.log()都可以)。0 P: |8 D8 O+ U. E9 ]2 z' z
// console.time() and console.timeEnd() method
// console.time() method
console.time("Let's see time console")
let time1 = function(){
console.log('time1 function is running')
}
let time2 = function(){
console.log('time2 function is running')
}
time1()
time2()
// console.timeEnd() method
console.timeEnd('Time Taken')
. q( ?! c3 E$ Y# g% }6. console.table()# P7 p7 Z5 z/ O' e. m4 Y
这个方法允许我们在控制台中生成表格。输入数据必须是数组或显示为表格的对象。 ' a( w! y, `7 M0 p, u& P% S
// console.group() and console.groupEnd() method
// console.group() method
console.group('This is a sample group')
console.log('This is a sample group log')
console.warn('This is a sample group warning')
console.error('This is a sample group error')
// console.groupEnd() method
console.groupEnd('This is a sample group')
console.log('This is a new section')