ES6 Object.assign()方法的用法

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将多个对象的所有枚举属性拷贝到目标对象上

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var target={a:1,b:2};
var source1={b:3,c:4};
var source2={c:5,d:6};

var newTarget=Object.assign(target,source1,source2);

console.log('target '+target);
console.log('newTarget '+newTarget);

输出: 

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target {a:1,b:3,c:5,d:6}
newTarget {a:1,b:3,c:5,d:6}

拷贝出新对象, 不修改原对象

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var target={a:1,b:2};
var newTarget=Object.assign({},target,{c:3});

console.log('target '+ target);
console.log('newTarget '+ newTarget);

输出: 

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target {a:1,b:2}

newTarget {a:1,b:2,c:3}