Concatenate strings on multiple lines in JavaScript

This question already has an answer here:

Creating multiline strings in JavaScript 34 answers

---

Try:

var css = '.myclass { text-align: center .... };' + 
          '.myclass { something else .... };';

Or:

var css = [
           '.myclass { text-align: center .... };',
           '.myclass { something else .... };'
          ].join("n");

---

Yes, if you are fine with only evergreen browsers you can use the new ` quotes:

var css = `
.multiple {
  lines: can;
  go: here;
}
`;

If you need to support non-evergreen browsers you can use one of several multi-line string methods:

// Escape new lines (slash must be the *last* character or it will break
var css = '
.multiple {
  lines: can;
  go: here;
}';

// Use comments and `toString` parsing:
var css = extractMultiLineString(function() {/*
.multiple {
  lines: can;
  go: here;
}
*/});

// Not tested, but this is the general idea
function extractMultiLineString(f) {
  var wrappedString = f.toString();
  var startIndex = wrappedString.indexOf('/*') + 2;
  var endIndex = wrappedString.lastIndexOf('*/') - 1;
  return wrappedString.slice(startIndex, endIndex);
}

---

您可以使用+=运算符连接到一个变量。

css = '.myclass { text-align: center .... };'
css += '.myclass { something else .... };';

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