Commit be7ac84

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栈的pop和peek操作增加栈为空的判断,提高代码健壮性

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Original file line number	Diff line number	Diff line change
`@@ -12,11 +12,13 @@ export default class Stack {`
`12`	`12`
`13`	`13`	`// pop() 出栈操作,从栈中取出元素,并返回取出的那个元素`
`14`	`14`	`pop() {`
	`15`	`+ if(this.isEmpty()) throw new Error('栈空了');`
`15`	`16`	`return this.items.pop();`
`16`	`17`	`}`
`17`	`18`
`18`	`19`	`// peek() 查看栈顶元素`
`19`	`20`	`peek() {`
	`21`	`+ if(this.isEmpty()) throw new Error('栈空了');`
`20`	`22`	`return this.items[this.items.length - 1];`
`21`	`23`	`}`
`22`	`24`

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