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We don't need to add semicolon at end of the statement in javascript, it will add automatically. It will consider every line as statement. So you have to use string concatenation for declaring multiline strings. ES6 has given a feature to avoid string concatenation for multiline strings

Using ES5

var tmp = 'line 1 ' +
'line 2 ' +
'line 3 ' +
'line 4 ';

console.log(tmp);

Using ES6

var tmp = `line 1 
line 2
line 3
line 4 `;

console.log(tmp); 
alert(tmp);