【JS设计模式】策略模式的代码示例

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function BookStrategy() {
  this.calcPrice = function( price ) {
    console.log("未打折 = " + price);
  }
}
function BookCalc9Strategy() {
  this.calcPrice = function( price ) {
    console.log("原价是："+ price +";打9折后：" + (price * 0.9));
  }
}


function BookCalc8Strategy() {
  this.calcPrice = function( price ) {
    console.log("原价是："+ price +";打8折后：" + (price * 0.8));
  }
}


function BookCalc7Strategy() {
  this.calcPrice = function( price ) {
    console.log("原价是："+ price +";打7折后：" + (price * 0.7));
  }
}

function PriceCalc( _strategy ) {
  this.strategy = _strategy;
  this.getPrice = function( price ) {
    return this.strategy.calcPrice( price );
  }
}

function Client() {


  var price = 100;
  var priceCalc = null;
  if ( 199 <= price && price < 399 ) {
    priceCalc = new PriceCalc(new BookCalc9Strategy());
  } else if ( 399 <= price && price < 599 ) {
    priceCalc = new PriceCalc(new BookCalc8Strategy());
  } else if ( 599 <= price ) {
    priceCalc = new PriceCalc(new BookCalc7Strategy());
  } else {
    priceCalc = new PriceCalc(new BookStrategy());
  }


  priceCalc.getPrice(price);


}
Client();

【JS设计模式】策略模式的代码示例

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原文地址：http://blog.csdn.net/itpinpai/article/details/51596125