jquery中怎么比较字符串是否相等

var str1 = "hello";var str2 = "world";if(str1 === str2){  console.log("字符串相等");}else{  console.log("字符串不相等");}

var str1 = "  hello  ";var str2 = "world";if($.trim(str1) === str2){  console.log("字符串相等");}else{  console.log("字符串不相等");}

var str1 = $("div#div1").text();var str2 = "world";if(str1 === str2){  console.log("字符串相等");}else{  console.log("字符串不相等");}

var str1 = $("input#input1").val();var str2 = "world";if(str1 === str2){  console.log("字符串相等");}else{  console.log("字符串不相等");}