if (donutString.indexOf("dozen") = function parseDonuts(donutString) {numDonuts = parseInt(donutString);if (donutString.indexOf("dozen") = -1) //!= numDonuts *= 12;return numDonuts;

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if (donutString.indexOf(

if (donutString.indexOf("dozen") = function parseDonuts(donutString) {numDonuts = parseInt(donutString);if (donutString.indexOf("dozen") = -1) //!= numDonuts *= 12;return numDonuts;
if (donutString.indexOf("dozen") =
function parseDonuts(donutString) {
numDonuts = parseInt(donutString);
if (donutString.indexOf("dozen") = -1) //!=
numDonuts *= 12;
return numDonuts;

if (donutString.indexOf("dozen") = function parseDonuts(donutString) {numDonuts = parseInt(donutString);if (donutString.indexOf("dozen") = -1) //!= numDonuts *= 12;return numDonuts;
donutString里是否含有"dozen"
indexOf() 方法可返回某个指定的字符串值在字符串中首次出现的位置.
indexOf() 方法对大小写敏感!
如果要检索的字符串值没有出现,则该方法返回 -1.
实例
在本例中,我们将在 "Hello world!" 字符串内进行不同的检索:
var str="Hello world!"
document.write(str.indexOf("Hello") + "
")
document.write(str.indexOf("World") + "
")
document.write(str.indexOf("world"))
以上代码的输出:
0
-1
6

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