Web development js string concatenation placeholder and conlose object API detailed explanation

// %s Example let s1 = 'love'
let s2 = 'Motherland'
console.log('001--I%s my%s', s1, s2) // -> I love my motherland // %f and %i, %d examples/*
    It is recommended to use %f, both integers and decimals are OK. %d can only output integers, and decimals will be ignored directly*/
let n1 = 100
let n2 = 5.8
console.log('002--I'm %d points away from %d points', n1, n2) // -> I'm 5 points away from 100 pointsconsole.log('002--I'm %i points away from %i points', n1, n2) // -> I'm 5 points away from 100 pointsconsole.log('003--I'm %f points away from %f points', n1, n2) // -> I'm 5.8 points away from 100 points// %oExamplelet o = { name: 'Kakashi', age: 25 }
console.log('004--The information of the ninja performing the mission is %o', o) // -> The information of the ninja performing the mission is {name: "Kakashi", age: 25}        
//%c example var str = '005--I am a %c example'
let st = 'color: #000; background-color: orange; padding: 5px;);'
console.log(str, st)
console.log(
    '006--%c---------------I am a separator-----------------',
    'color:red;font-size:10px'
)
ript>

let o = {
    username: "kakashi",
    age: 25,
    Skill:['Chidori', 'Earth Flow Wall', 'Sharingan']
}
console.table(o);

console.log('001--I am a normal output statement');
console.info('002--I am a normal information output statement');
console.warn('003--I am a warning output statement');
console.error('004--I am an error output statement');

console.group('First round of output')
console.log('I am the first round of output statement 1')
console.log('I am the first round of output statement 2')
console.log('I am the first round of output statement 3')
console.log('I am the first round of output statement 3')
console.groupEnd()

console.groupCollapsed('First round of output')
console.log('1 is output again')
console.log('2 is output again')
console.log('Another 3 is going to be output')
console.groupEnd()

console.log('last output')