1, Object attribute deletion
function fun(){ this.name = 'mm'; } var obj = new fun(); console.log(obj.name);//mm delete obj.name; console.log(obj.name); //undefined
2, Variable deletion
var name = 'lily'; delete name; console.log(name); //lily
You cannot delete variables directly with delelte
3. The variables in the prototype chain cannot be deleted
fun.prototype.age = 18; delete obj.age; console.log(obj.age) //18
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