javascript - 警告 : Expected an assignment or function call and instead saw an expression

Question

我正在查看文档源文件 index.js来自this library 。我检查了jshint中的代码，有一个警告说:

Expected an assignment or function call and instead saw an expression.

文件:index.js Line: 215

s = (Math.sqrt((x * x) + (y * y)) / r) * 100;

为什么我会收到警告，该如何解决？

Answer 1

迈克尔刘是正确的。在the jshint website ，用分号替换逗号可以消除警告:

function main() {
  var currentTargetHeight = 240;
  var e = {clientX: 40, clientY: 50};
  var startPoint = { left: 3, right: 4};
  var r, x, y, h, s;
  r = currentTargetHeight / 2;
  x = e.clientX - startPoint.left - r;
  y = e.clientY - startPoint.top - r;
  h = 360 - ((Math.atan2(y, x) * 180 / Math.PI) + (y < 0 ? 360 : 0));
  s = (Math.sqrt((x * x) + (y * y)) / r) * 100;
}

main();