理解JavaScript未定义变量
// Initialize these three variables
var a=5;
var b=10;
var c="I am a";
// Do not change code below this line
a = a + 1;
b = b + 5;
c = c + " String!";温馨提示
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// Initialize these three variables
var a=5;
var b=10;
var c="I am a";
// Do not change code below this line
a = a + 1;
b = b + 5;
c = c + " String!";