The general form of ternary operation is divided into the following two types
// 第一种
// 如果str不等于null或undefined 那就让str等于'有' 否则str等于'无'
str?'有':'无' 即 str!=null||undefined?'有':'无'
// 第二种
// 如果name等于'小明' 那就等于'小明' 否则不管name原来是什么 我不管 现在就让name等于'小红'
name=='小明'?'小明':'小红'
// 如果number大于数字3 那就让number等于 '大' 否则让number等于 '小'
number>3?'大':'小'
// 如果score小于数字60 那就让result等于 '不及格' 否则让result等于 '及格'
score<60?result='不及格':result='及格'
After understanding the above code, the following are all repeated, no need to waste time reading
The first type is generally abbreviated and fully written as follows
// 第一种
str!=null||undefined?'有':'无'Interpretation: Determine whether the variable str is not null or undefined
Did you feel a little convoluted when you first touched it? (Just go around)
The second is to judge whether the previous part is true
// 第二种
// 如果name等于'小明' 那就等于'小明' 否则不管name原来是什么 我不管 现在就让name等于'小红'
name=='小明'?'小明':'小红'
// 如果number大于数字3 那就让number等于 '大' 否则让number等于 '小'
number>3?'大':'小'
// 如果score小于数字60 那就让result等于 '不及格' 否则让result等于 '及格'
score<60?result='不及格':result='及格'
true → display the former (what follows immediately after the ? )
false → display the latter (followed by :)