javascript - 字符串计算的小数

Question

我有一个测验程序的 JavaScript 代码，但我不知道如何返回最后一个上下文行的计算结果，只有 1 位小数。有什么建议吗？

EndQuiz=function(){
                  canvas.removeEventListener('click',ProcessClick,false);
                  context.drawImage(quizbg, 0,0,550,90,0,0,550,400);
                  context.font = "20pt Georgia,Arial";
                  context.fillText("Thanks for finishing. ",20,80);
          context.fillText("This is how good you were:",20,120);
                  context.font = "16pt Georgia,Calibri,Arial";
                  context.fillText("Correct answers: "+String(rightanswers)+" of "+String(rightanswers+wronganswers),20,180);

          context.fillText("Correct: "+String(rightanswers/(wronganswers+rightanswers)*100)+"%",20,240);1

Answer 1

直接来自 W3schools:

将数字转换为字符串，只保留两位小数:

var num = 5.56789;
var n=num.toFixed(2);

n 的结果将是:

5.57

剩下的留给读者作为练习:-)