web前端学习
总结:a&&b 分false 和true两个大类。
false:0,NaN,null,false,undefined
true:非false.
当a为false类时,返回a的值(b不会执行到);当a为true类时,返回b的值
看里面的例子就明白了
web前端学习
web前端学习
总结:a&&b 分false 和true两个大类。
false:0,NaN,null,false,undefined
true:非false.
当a为false类时,返回a的值(b不会执行到);当a为true类时,返回b的值
看里面的例子就明白了
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