// 通過(guò)+號(hào)的方式
var longString = 'long '+
'string '+
'is '+
'very '+
'long'
console.log(longString) // long string is very long
// 通過(guò)斜杠的方式
var longString = 'long \
string \
is \
very \
long'
console.log(longString) // long string is very long
// concat
vat longString = ''.concat('long ','string ','is ','very ','long')
console.log(longString)
