Object.is('a','a');//true
let num1 = 1;
let num2 = 1;
Object.is(num1,num2);//true
Object.is(NaN,NaN);//true
Object.is(-0,+0);//false
比较两个值是否相等
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转载自blog.csdn.net/wadedt/article/details/88418711
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