Multi-line Strings(多行字符串)
拼接多行字符串
var roadPoem = 'Then took the other, as just as fair,nt'
+ 'And having perhaps the better claimnt'
+ 'Because it was grassy and wanted wear,nt'
+ 'Though as for that the passing therent'
+ 'Had worn them really about the same,nt';
在ES6中,用反引号``
var roadPoem = `Then took the other, as just as fair,
And having perhaps the better claim
Because it was grassy and wanted wear,
Though as for that the passing there
Had worn them really about the same,`;