switch:
function a(c,d){ switch(c+d){ case 4: console.log(4); break; case 5: console.log(5); break; case 6: console.log(6); break; case 7: console.log(7); break; default: console.log('不是4,5,6,7'); break; } }; a(3,4); 7
default后是有冒号的,相当于else。
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